They called him "Momo." For two decades, Sam Giancana ran one of the most profitable criminal empires in America. He rigged elections, shared a mistress with a president, and helped the CIA in a plot to assassinate Fidel Castro. But on June 19, 1975, on the eve of the day he was supposed to testify before Congress about all of it, someone entered the basement kitchen of his home in Oak Park, Illinois, and fired seven bullets into his head. One in the mouth, six in a circle around his chin and neck. It was a clear message from the Mafia. This is the story of the gangster who knew too much and paid for it with his life.
Sam Giancana was born Salvatore Giangana on May 24, 1908, in a neighborhood on the Near West Side of Chicago that people called "The Patch." It was a Little Italy, packed with Sicilian immigrants who came to America with nothing and built their world on Taylor Street. The housing was cramped, the streets were dirty, and opportunities came in only two kinds: legal or illegal. For most children of The Patch, illegal work was more profitable.
Sam's father was a peddler with a handcart. His mother died when he was two years old. He grew up rebellious, roaming the streets, skipping school, and getting into fights. By age ten, Sam had already been arrested for stealing a car. By fourteen, he had dropped out of school entirely. He could barely read or write, but he was skilled at swindling. More importantly, he could hurt people without thinking twice.
In the 1920s, Sam joined a gang called the "42 Gang," named after Ali Baba and the Forty Thieves. These were not just kids having fun with crime. The 42 Gang served as a farm team for the Chicago Outfit, the Mafia organization that ran the city. They hijacked trucks, robbed warehouses, beat up union organizers, and carried out whatever the bosses demanded. The 42 Gang produced some of the most brutal killers of the Chicago Outfit. Sam Giancana was one of them.
At some point, Sam earned the nickname "Momo." Some said it was short for "momo," which means "crazy" in Italian. Others said it came from his ability to deceive people, charm them, and make them trust him before he betrayed them. Either way, the name stuck.
By the time he reached his twenties, Sam had graduated from the 42 Gang to the big leagues. He moved to work with Paul "The Waiter" Ricca and Tony "Joe Batters" Accardo, two of the most powerful men in the Chicago Outfit. Sam ran "wheel games," illegal betting operations that were the Mafia's livelihood in the Black neighborhoods of the South Side. He was good at it. He was a big earner for them. And in the Mafia world, whoever makes money gets promoted.
Sam also handled the dirty work, from enforcing authority and collections to sometimes carrying out assassinations. He never blinked. He never hesitated. He never said a word.
By the 1940s, Sam Giancana was an official member of "The Organization," and his rise was fast. In 1942, Sam was arrested for bootlegging and draft evasion. He told the draft board he was constitutionally unfit, too crazy to serve. The Army believed him and sent him home. The Organization believed him too, but in a different way. They knew Sam was crazy enough to do whatever the situation required.
By the early 1950s, Sam was running illegal operations throughout Chicago. He controlled the wheel games on the South Side, the casinos of Cicero, and the betting rooms covering the Midwest. He was Accardo's first assistant. And in 1957, when Accardo decided to step back from daily operations, he handed the keys to the kingdom to Sam Giancana. At forty-nine years old, Sam "Momo" Giancana became the leader of the Chicago Outfit. For the next decade, he would become the most powerful gangster in America.
When Sam Giancana took over the Chicago Outfit in 1957, he inherited an entire empire. The Organization controlled gambling, prostitution, loan sharking, and labor racketeering across the Midwest. They had politicians on their payroll, judges in their pocket, and police officers who looked the other way. Most importantly, they had Las Vegas.
Chicago's Mafia had been skimming money from Las Vegas casinos since the 1940s. The Stardust, the Desert Inn, and the Riviera all had Chicago money behind them. Cash came in the front door as bets, was counted in the cage, and then a percentage was skimmed before the casino reported to the tax authorities. That skimmed money went straight back to Chicago, millions of dollars a year, untaxed and untraceable. Sam Giancana's job was to keep that money flowing.
But Sam wanted more than money. He wanted respect. He wanted to be seen in the spotlight. And here he differed from his predecessor. Tony Accardo was more like a ghost. He lived quietly in a mansion in River Forest, played golf, and never spoke to reporters. Sam Giancana did the exact opposite.
He began appearing publicly in public places. He socialized with celebrities. He dated singers. He traveled to Las Vegas and sat in the front rows at the Sands, where Frank Sinatra and the Rat Pack performed. Sinatra and Sam became close. Frank introduced Sam to everyone. Dean Martin, Sammy Davis Jr., and Peter Lawford all knew Momo. They drank with him. They gambled with him. They did not ask many questions about the nature of his work.
Frank needed the Mob's help running the casinos. Sam needed Frank's charm to give himself a veneer of legitimacy. It was a perfect arrangement.
In 1960, Sam fell in love. Her name was Phyllis McGuire, one of the McGuire Sisters trio, a singing group that sold millions of records. Phyllis was beautiful and talented, and twenty years younger than Sam. She was also dating other men. Sam did not care. He showered her with gifts, jewelry, furs, and money. He traveled with her to Europe. He bought her a mansion in Las Vegas. He was obsessed with her.
The FBI noticed. They had been watching Sam for years, but now they began following him everywhere. Agents sat outside his home on South Wenonah Street in Oak Park. They trailed him to restaurants, nightclubs, and the airport. They planted bugs in his phone. They planted bugs in his car. They even planted devices in his girlfriend's dressing room. The surveillance was constant and suffocating. And it was about to get worse.
Because while Sam was living the high life in Vegas, another powerful family had noticed him. The Kennedy family.
In 1959, according to multiple sources, including Sam's own family, Joe Kennedy, the Kennedy patriarch, contacted the Chicago Outfit. Joe wanted his son Jack to run for president, and he needed help. Joe Kennedy knew the Outfit well. He had worked with them during Prohibition, smuggling whiskey into the country and making millions. He understood how they operated, and he realized that the Chicago Outfit controlled the votes. If the Outfit wanted you to win Cook County, you won Cook County. It was that simple.
The story goes that Joe Kennedy met with Sam Giancana at a hotel in Chicago. Joe asked Sam to help ensure Illinois went for Jack in the 1960 election. In return, Joe promised that once Jack was president, the government would stop pursuing the Outfit. No more raids, no more prosecutions. Business as usual.
Sam agreed. And why wouldn't he? The deal made sense. He helped elect a president, and he got the Feds off his back. It was just another deal.
In November 1960, the presidential election between John F. Kennedy and Richard Nixon came down to a few states. Illinois was one of them. The vote in Chicago was crucial. And the Outfit delivered.
Sam's men went to work. They sent ward bosses into neighborhoods. They rounded up voters. Some of them alive, some of them dead. They stuffed ballot boxes. They threatened election observers. They did whatever was necessary. When the dust settled, Kennedy won Illinois by fewer than 9,000 votes. Nationally, he won by one-tenth of one percent.
Sam Giancana believed he had put a president in the White House. He believed Joe Kennedy owed him. He believed the deal would hold. He was wrong.
Once John Kennedy took office, his brother Bobby became attorney general. And Bobby Kennedy hated the Mob. He had made his name in the late 1950s going after gangsters as counsel to the Senate racketeering committee. He had interrogated Sam Giancana on television in 1959, humiliating and mocking him, asking if he giggled like a little girl every time he took the Fifth Amendment. Bobby never forgot that. And he never forgave it.
As attorney general, Bobby launched an all-out war on organized crime. He doubled the number of FBI agents assigned to Mob cases. He authorized wiretaps, surveillance, and the use of informants. He pursued the Outfit with a ferocity greater than any attorney general in history.
Sam felt betrayed. He had given them Chicago. He had helped make Jack Kennedy president. And now Bobby was destroying his organization. The deal was over. The Kennedys had double-crossed him, and Sam Giancana never forgot a double cross.
In 1960, as the Kennedy campaign was ramping up, the CIA faced a problem. Fidel Castro had taken over Cuba, and the Agency wanted him dead. They tried everything: exploding cigars, poison pens, and sniper rifles. Nothing worked. So they decided to try something different. They decided to hire the Mafia.
The logic was simple. The Outfit had run Havana before Castro. They owned the casinos, the hotels, and the brothels. When Castro came to power, he threw them all out and seized their assets. The Outfit wanted Castro dead as much as the Agency did. So the Agency reached out to them.
The CIA's contact was a man named Robert Maheu, a former FBI agent turned private investigator who did dirty work for the government. Maheu contacted Johnny Roselli, a gangster who had represented the Outfit in Los Angeles and Las Vegas for years. Roselli agreed to help and brought in Sam Giancana.
The plan was called "Operation Mongoose." The idea was to use the Outfit's contacts in Cuba to slip poison into Castro's food or drink. The CIA provided the poison pills. The Outfit provided the access. The plan seemed simple. It was not.
The first problem was getting the pills to Cuba. The second problem was finding someone Castro trusted enough to get close to him. The third problem was that Castro was paranoid. He had food tasters. He constantly changed his schedule. He slept in different places every night. Killing him was nearly impossible.
Sam and Johnny tried anyway. They sent pills to Havana through Mafia contacts. They bribed officials. They recruited agents. But every attempt failed. Castro survived.
Meanwhile, the CIA kept asking for more help. They authorized other plots: poisoned diving suits, exploding seashells, and Mafia snipers. None of them worked. Castro kept giving speeches, running Cuba, and staying alive.
The relationship between the CIA and the Mafia grew stranger. Agency officials met with Mafia men in hotel rooms and safe houses. They exchanged money under the table. They authorized assassinations of foreign leaders. And it was all secret, deniable, and illegal.
Sam Giancana loved it. Here he was, a gangster from the West Side of Chicago, working with the United States government. He had access. He had influence. He had secrets. And secrets, in Sam's world, were currency.
But the operation was doomed from the start. The CIA never fully trusted the Mafia. The Mafia never fully trusted the CIA. And somehow, Castro kept surviving.
By 1963, Operation Mongoose had effectively ended. The Castro assassination attempts had failed. The Bay of Pigs invasion had failed. The Cuban Missile Crisis had brought the world to the brink of nuclear war. And the Kennedys, who had authorized this whole mess, were looking for a way out.
Sam Giancana, meanwhile, was keeping score. He had helped the CIA try to kill a foreign leader. He had helped Joe Kennedy elect his son. And what did he get in return? Bobby Kennedy was prosecuting his friends, the FBI was following him into the bathroom, and a government was about to abandon him. Sam had enough secrets to bring down a presidency. The only question was whether he would ever use them.
While Sam Giancana was conspiring with the CIA and dodging Bobby Kennedy's Justice Department, the FBI was building a case against him. J. Edgar Hoover wanted Sam badly, and the Bureau's favorite weapon was surveillance.
By the early 1960s, the FBI had planted bugs in Sam's phones, in his home, and agents were following him twenty-four hours a day. They recorded his conversations with Mafia associates. They photographed him with celebrities. They documented his every move.
The surveillance was so intense that Sam started joking about it. He waved at the agents. He sent them coffee. He drove in circles just to waste their time. But the bugs picked up something the FBI did not expect.
Sam was having an affair with a woman named Judith Campbell Exner. And Judith was also seeing President John F. Kennedy. Judith Campbell was a beautiful dark-haired woman who had been introduced to John F. Kennedy by Frank Sinatra in early 1960. She and the president began an affair that lasted for years. She visited the White House. She called him on private lines. And at the same time, she was also meeting with Sam Giancana.
The implications were staggering. The president of the United States was sharing a mistress with the boss of the Chicago Mafia. If that ever got out, it would destroy Kennedy politically, and Sam knew it. The FBI knew it too. Hoover informed the president in March 1962 that they were aware of the relationship. Judith's contacts with the White House stopped immediately. But the damage was done. Sam Giancana now had leverage over the most powerful man in the world.
Then there was Marilyn Monroe. According to Sam's brother Chuck and his nephew Sam, who wrote a book called Double Cross decades later, Sam Giancana was allegedly involved in Marilyn Monroe's death. The book claims that in August 1962, the CIA asked Sam to get rid of Marilyn because she knew too much about the Kennedy brothers, about the Mafia, and about everything.
The book alleges that Sam sent men to Marilyn's house on August 4, 1962. They waited until she was alone. They covered her mouth with tape. They inserted a barbiturate suppository that killed her quickly without leaving pill residue in her stomach. And they made it look like a suicide.
The official cause of death was listed as a probable suicide by overdose, but the story was never convincing to investigators. There were inconsistencies. The timeline did not match. Witnesses changed their stories. And Marilyn had been talking about revealing what she knew about the Kennedy family. The debate still continues over whether Sam was actually involved. But one thing is certain. Sam had secrets that incriminated the Kennedy family. He had access to them. He had motive. And he had the capability to carry it out.
The surveillance continued. The bugs kept recording. And in the background, Sam Giancana kept collecting secrets. He knew about the CIA plots. He knew about the women. He knew where the bodies were buried, literally and figuratively.
Then on November 22, 1963, everything changed. President John F. Kennedy was shot in Dallas at 12:30 p.m. on November 22, 1963. Lee Harvey Oswald was arrested. Two days later, Jack Ruby walked into Dallas police headquarters and shot Oswald dead on live television.
Jack Ruby was a nightclub owner with Mafia connections. He had run clubs in Dallas since the late 1940s, and he had been reporting to the Chicago Outfit the entire time. This is where the theory begins.
In the years following the assassination, multiple sources claimed that the Mafia was involved in the killing of John F. Kennedy. The motive was clear. Bobby Kennedy's war on organized crime had crippled the Mob's operations. Prosecutions had increased. Informants had started talking. The Las Vegas skim had been disrupted. The Mafia wanted Bobby gone. And the only way to get rid of Bobby was to kill his brother.
According to the book Double Cross, Sam Giancana confessed to his brother Chuck that he had played a role in the assassination. Sam allegedly told Chuck that he had met with both Lyndon Johnson and Richard Nixon before the killing and that they were aware of the plan. Johnson had much to gain. Nixon had Mafia ties going back decades.
The book claims the CIA was involved as well. The same agents who recruited Sam to kill Castro allegedly used the same networks to kill Kennedy. Lee Harvey Oswald had spent time in Russia. He had intelligence connections. He was the perfect patsy.
Then there was Jack Ruby. Jack Ruby's shooting of Oswald made no sense unless you understood Ruby's role. He was not a lone lunatic avenging the president. He was simply a Mafia errand boy who was told to silence Oswald. Ruby walked into that police station, shot Oswald in the stomach, and ensured the truth would never be revealed.
Ruby died of cancer in prison in 1967, just weeks before he was scheduled to testify again about the assassination. He told reporters before his death that the truth would never be known because the people involved were too powerful.
Did Sam Giancana order Kennedy's death? Probably not directly. But did he know about it? Did he help with it? Did he provide resources, contacts, and cover? The FBI thought so. Investigators thought so. And decades of research suggest that the Mafia, the CIA, and possibly elements of the government all had pieces of the puzzle.
Sam Giancana never admitted anything publicly. But he hinted privately to family members that he knew more than he could say, and that this knowledge would eventually get him killed.
After the Kennedy assassination, Bobby Kennedy resigned as attorney general in 1964. The war on the Mafia slowed, but the FBI did not stop. They kept the pressure on Sam Giancana.
In 1965, a federal grand jury in Chicago subpoenaed Sam to testify about Mafia operations. Sam refused. He took the Fifth Amendment on every question. The judge sentenced him to a year in prison for contempt of court.
Sam was released in 1966. By then, the Organization had changed. Tony Accardo was still the real power behind the throne, but younger men were moving up. Sam's position was weaker. The surveillance had made him a liability. He could no longer operate without the Feds watching him. He could no longer meet with his crew. He could no longer make money.
So in 1966, Sam made a decision. He left the country. He moved to Cuernavaca, Mexico, a resort town south of Mexico City. He lived in a villa, played golf, and tried to stay out of sight. But the FBI and CIA did not stop watching him. They knew where he was. They knew who he met. And they kept waiting.
Sam stayed in Mexico for eight years. During that time, the Organization kept operating in Chicago. The Vegas skim continued. The illegal activities kept thriving. Sam was out of the picture, but the machine he had helped build kept running without him.
Then in 1974, the Mexican government deported him. Officially, they said his visa had expired. Unofficially, U.S. government pressure made Sam's presence undesirable. He flew back to Chicago and moved into a basement apartment in his daughter Bonnie's house in Oak Park, the same quiet suburb where he had grown up.
Sam was sixty-six years old. He was powerless, broke, and about to become the most dangerous man in America, because in 1975 the U.S. Senate decided to investigate the CIA's involvement in the assassination of foreign leaders. The committee was chaired by Senator Frank Church. And one of the first people they wanted to talk to was Sam Giancana.
The Church Committee subpoenaed Sam in June 1975. They wanted him to testify about Operation Mongoose, the Castro assassination plots, and the CIA's relationship with the Mafia. Sam was scheduled to appear before the committee on June 24. He never made it.
On the evening of June 19, 1975, Sam Giancana sat alone in the basement apartment of his daughter Bonnie's house at 1147 South Wenonah Avenue in Oak Park, Illinois. The house was quiet. Bonnie and her husband were out of town. Sam was alone, which was rare in those days. The FBI had been watching him for years, but tonight, for some reason, they were not outside.
Sam was in the kitchen preparing a late dinner. Sausages with peppers, dandelion greens, and beans. Simple food, the kind his mother used to make in the neighborhood fifty years earlier. Comfort food. Food that reminded him of a time before power, before money, and before the secrets that were about to cost him his life.
It was around 10 p.m. when someone knocked on the door. Sam walked over and opened it. Whoever was standing there, Sam knew him. He trusted him. He let him in without hesitation. Then he turned his back and went back to the stove. That was his mistake.
The visitor pulled out a .22-caliber pistol equipped with a silencer on the barrel. Quiet, professional. The kind of weapon you use when you do not want the neighbors to hear. The first bullet hit Sam in the back of the head, just above the neck. The impact force pushed him forward. He slammed into the stove, sending pots and pans clattering onto the kitchen floor. Sausages rolled into the corners. Peppers splattered against the wall.
Sam fell, but he was not dead yet. The killer walked closer and kept firing. Six more bullets followed. One of them hit Sam in the mouth. In total, seven bullets, each one deliberate. Each one placed with precision. The bullet that struck the mouth was the signature. It was a message from the Mafia. You talked too much. Or you were about to.
When it was over, the killer stood there for a moment. Looking at the body of one of the most powerful Mafia men in American history. Then the killer wiped the weapon. And dropped it on the floor next to Sam's body. And walked out.
No break-in. No struggle. No witnesses. Just Sam Giancana. The man who ran the Chicago Outfit for a decade. The man who worked with the CIA. The man who shared a mistress with the president of the United States, lying on his kitchen floor in a pool of blood and cold sausages.
The apartment door was locked from the inside. Whoever killed Sam had a key. Or Sam had locked it after letting him in. Either way, it did not matter. The killer was gone.
Bonnie's husband found the body the next morning when they returned home. He walked into the kitchen and saw Sam lying face down near the stove. He called the police.
By noon, Oak Park was swarming with investigators. Homicide detectives from the Cook County Sheriff's Office, FBI agents, reporters, and photographers all wanted a piece of the story. Sam Momo Giancana, the legendary Mafia boss, had been murdered in his own home. By evening, it was the lead story on every news broadcast in the country.
The timing is what made it explosive. Sam Giancana had been subpoenaed by the U.S. Senate just days earlier. The Church Committee, officially the Senate Select Committee to Study Governmental Operations with Respect to Intelligence Activities, was investigating the CIA's involvement in the assassination of foreign leaders. And Sam was one of their key witnesses. He was scheduled to testify on June 24, 1975. Five days after his murder.
The committee wanted to question Sam about Operation Mongoose, the CIA-backed plots to assassinate Fidel Castro. They wanted to know more about the poison pills, the Mafia's contacts in Cuba, and the meetings with CIA officials. They wanted Sam to tell them everything. And Sam was going to do it. Not because he wanted to cooperate, but because he was angry. Angry at the government for using him and then discarding him. Angry at the Organization that had cast him out, and angry at the Kennedys for betraying him.
Sam had spent his entire life keeping secrets. But now, at sixty-seven, broke and powerless, he had nothing left to lose but his life.
The Chicago Outfit could not allow Sam to testify. Tony Accardo, the real power behind the throne, and Joey Aiuppa, the current boss, knew what Sam could say. He could talk about the Las Vegas skim, the bribes to politicians and judges, the murders, the extortion, and the loan sharking. He could destroy the entire Organization. More than that, Sam could implicate the CIA. He could describe government agents meeting with gangsters to plan the assassination of a foreign leader. He could expose the partnership between organized crime and the American intelligence community. He could blow open one of the biggest scandals in American history.
So the decision was made. Sam had to go.
The hit was clean and professional. Someone Sam trusted entered his home, shot him seven times, and walked out. The Oak Park police department launched an investigation. They interviewed hundreds of people. They looked into Mafia figures, CIA agents, former associates, and anyone with a motive. But nobody talked. Nobody saw anything. There were no fingerprints on the weapon. There were no witnesses. The case went cold almost immediately.
The leading theory among investigators was that the Chicago Outfit had ordered the hit. Accardo or Aiuppa gave the order, and someone close to Sam carried it out. Some investigators suspected Butch Blasi, Sam's driver and former bodyguard, who was seen in the neighborhood that night. Others believed it was Chuckie English, another Organization member who knew Sam well. But without evidence, and without witnesses, the case died.
Some investigators whispered about the CIA. What if the Agency decided Sam had become too dangerous to testify? What if they contracted the hit themselves, using their Mafia connections to cover their tracks? It was not impossible. The Agency had worked with the Mafia before. Why not again? But those theories went nowhere. The CIA denied involvement. The Mafia said nothing. And Sam Giancana stayed dead.
One week after Sam's murder, Johnny Roselli, his partner in the Agency's plots against Castro, appeared before the Church Committee. Roselli told the senators about Operation Mongoose. He described the poison pills, the meetings with Agency officials, and the Castro assassination attempts. But he did not tell them everything. He could not. Some secrets died with Sam.
Roselli knew he was next. In July 1976, thirteen months after Sam's murder, Johnny Roselli disappeared. His body was found ten days later, stuffed inside a 55-gallon oil drum floating in Dumfoundling Bay near Miami. He had been strangled, shot, and dismembered. The Mafia was cleaning house. Everyone who knew about the Agency's plots, everyone who could testify, everyone who posed a threat. They were all being eliminated.
Sam Giancana thought his secrets would protect him. He thought the Outfit would not dare kill him because of what he knew. He thought the Agency would protect him because he had done their dirty work. He was wrong on both counts. In the end, Sam's secrets made him a target. And in the Mafia, when you become a liability, there is only one solution.
Seven bullets, a quiet kitchen in Oak Park, and decades of secrets buried with him in an unmarked grave.