In August 1940, a man who had carefully infiltrated the inner circle of exiled Russian revolutionary Leon Trotsky walked into Trotsky’s study in Mexico City, pulled an ice axe from under his coat, and struck him in the head. Trotsky died the next day. The assassin, who gave his name as Jacques Mornard, was arrested and sentenced to 20 years in prison. But his true identity, and the full extent of the Soviet operation behind the killing, would not be confirmed for decades.
Jaime Ramón Mercader del Río Hernández was born on February 7, 1913, in Barcelona, Spain. His mother, Eustaquia María Caridad del Río Hernández, came from a wealthy Cuban family and was an active member of the Spanish Communist Party. His father, Pau Mercader Marina, worked in the Catalan textile industry. After his parents divorced, Mercader grew up in France with his mother.
The 1920s and 1930s were turbulent years in Spain. The aftermath of World War I brought economic instability, and the country was marked by deep political polarization between socialists, anarchists, and nationalists. The collapse of the monarchy in 1931 and the rise of the Second Spanish Republic only deepened the divide between left and right. Mercader became involved with leftist Spanish groups and served a brief prison term in 1936.
When the Spanish Civil War broke out between the Republican government and General Francisco Franco’s nationalist forces, Mercader joined the Republican side. During this period, he came into contact with Soviet intelligence operatives, who recognized his ideological commitment. He was recruited by an NKVD officer and later trained in Moscow as a Soviet agent. By 1938, he had been chosen for a critical mission: the assassination of Leon Trotsky.
Trotsky was a leading figure in the Russian Revolution and one of Joseph Stalin’s most outspoken critics. Born on November 7, 1879, in Yanovka, Ukraine, then part of the Russian Empire, Trotsky rose from a farming family to become a prominent Marxist thinker and revolutionary. He had been a key leader in the 1917 revolution and a founder of the Red Army, but his rivalry with Stalin over the future of the Soviet Union proved fatal. Stalin promoted the idea of socialism in one country, arguing the Soviet Union should focus on building a socialist state within its own borders.
Trotsky, by contrast, advocated for permanent revolution, insisting that communism must spread globally. After Vladimir Lenin’s death in 1924, Stalin consolidated power and systematically marginalized Trotsky. By 1927, Trotsky was expelled from the Communist Party, and in 1929, he was exiled from the Soviet Union. Over the next decade, Trotsky was forced to move repeatedly, living in Turkey, France, and Norway.
In 1936, Mexican President Lázaro Cárdenas, who sympathized with his cause, offered him asylum. Trotsky accepted and arrived in Mexico in January 1937. He first stayed with muralist Diego Rivera and his wife Frida Kahlo, but after ideological and personal conflicts, he moved to a separate residence in Coyoacán. From there, he continued his political activities, established the Fourth International, and wrote extensively about Marxism and the Soviet Union.
Despite being in exile, Trotsky remained a primary target for Stalin. Soviet intelligence launched multiple assassination attempts, all of which failed. In 1938, Mercader, then studying at the University of Paris, befriended Sylvia Ageloff, a young woman from Brooklyn who was known to be close to Trotsky’s circle. Using the name Jacques Mornard, he told her he was the son of a Belgian diplomat and pretended to admire Trotsky’s work.
When Ageloff returned to New York, Mercader followed her, adopting a new alias, Frank Jackson, after a misspelling occurred during the forging of his documents. In October 1939, Mercader joined Ageloff in Mexico City, where she had already become a member of Trotsky’s inner circle and was working alongside his personal secretary. Mercader, posing as Jackson, became a familiar presence around Trotsky’s household, often dropping Ageloff off at work. Stalin approved two assassination plans in 1939.
The first, carried out on May 24, 1940, involved a team led by Mexican muralist and NKVD member David Alfaro Siqueiros. The attackers disguised as soldiers and fired more than 200 bullets into Trotsky’s home. Astonishingly, Trotsky and his wife survived. A second plan was then organized, led by NKVD officer Nahum Eitingon, who had originally recruited Mercader in 1936.
The plan called for Mercader, known to everyone as Frank Jackson, to gain access to Trotsky’s household through Ageloff and gradually earn the trust of the guards. Security had been significantly heightened after the May attack, with additional locked doors and a guard tower. Because of the tight security, an ice axe was chosen as the weapon, allowing for a silent and quick killing. Ageloff, believing Mercader shared Trotsky’s views, confided in him about Trotsky’s movements and household security, unaware that the information was being used to plan the assassination.
On August 20, 1940, Mercader was alone with Trotsky in his study, on the occasion of his tenth visit to the house. He approached Trotsky, pretending to show him a draft of a magazine article he had written. As Trotsky examined the documents, Mercader struck him in the head with the ice axe. Despite the severe injury, Trotsky fought back, screaming for guards and struggling with Mercader until reinforcements arrived.
The guards rushed into the office and began beating Mercader, nearly killing him. Trotsky, remarkably still conscious, ordered them to spare Mercader’s life and allow him to speak. Trotsky was rushed to the hospital and underwent surgery but died the next day, August 21, 1940, at the age of 60. Mercader was handed over to Mexican authorities but insisted his name was Jacques Mornard.
He claimed he had intended to marry Sylvia Ageloff and that Trotsky had forbidden their union, which, according to him, fueled his urge to kill. In a statement, Mercader described Trotsky as a man who destroyed his nature and his future, claiming Trotsky was responsible for making him a man without a name or a country. Ageloff was investigated and interrogated by Mexican authorities, who sought to determine how much she knew. She maintained her innocence, saying she was unaware of Mercader’s true intentions, and was released without charges.
However, historians still debate how much she knew about the plot. Following the assassination, Mercader’s mother, Caridad, was honored with the Order of Lenin for her role in the operation. Mercader’s trial began in March 1941 and drew international attention. At the time, his true identity remained unknown, and he was tried under the name Jacques Mornard.
It was not until after the collapse of the Soviet Union that his real identity was confirmed. His defense team tried to portray him as a disillusioned follower of Trotskyism acting out of personal revenge, but evidence mounted that he had been acting on behalf of Soviet intelligence. Witnesses, including Trotsky’s family and security personnel, provided detailed accounts of the attack, and evidence was presented of Mercader’s ties to the NKVD. The court found him guilty of murder and sentenced him to 20 years in prison.
Mercader remained unrepentant during his imprisonment, viewing his actions as a sacrifice for the Soviet cause. He refused to denounce his role in the assassination, and his Soviet handlers provided him with comforts, including financial support and a girlfriend, Raquel Mendieta, a Mexican actress whom he later married. The couple had two children. In 1960, after serving just over 20 years, Mercader was released.
His release drew international attention and was widely seen as a sign of Soviet influence. He briefly moved to Havana, Cuba, then traveled to the Soviet Union in 1961, where he was awarded the Hero of the Soviet Union, one of the country’s highest honors. For the rest of his life, Mercader split his time between Czechoslovakia, Cuba, where he worked as an advisor to the Foreign Affairs Ministry, and the Soviet Union. The infamous ice axe was stored in a Mexico City police evidence room for years before being acquired by a police officer, who passed it on to his daughter.
She kept it under her bed for four decades. In 2005, she decided to sell it. Trotsky’s grandson, Esteban Volkov, offered to provide a blood sample for DNA testing to authenticate the weapon if she agreed to donate it to the museum at Trotsky’s former home. She declined, seeking financial gain from its sale.
The ice axe was eventually purchased by Keith Melton, an American collector and founding board member of the International Spy Museum. Ramón Mercader died in 1978 at the age of 65 in Havana, Cuba, after battling lung cancer. His reported last words were: “I hear it always. I hear the scream.
I know he’s waiting for me on the other side. ” He was buried in Moscow’s Kuntsevo Cemetery. His story remains one of the most chilling examples of Cold War-era political violence, and a reminder of the lengths governments were willing to go to advance their ideologies.