On September 1, 1939, at dawn, German armed columns crossed the Polish border, entering the country from the north, west, and south at once. In London and Paris, the governments that had guaranteed Polish sovereignty prepared warnings that would become declarations of war within two days. In Warsaw, streets filled with civilians staring at the sky. Across the country, men headed to mobilization points and women began packing what could be carried.
In the city of Siedlce, east of Warsaw, a 16-year-old girl heard the news along with the rest of her countrymen. She was the daughter of a military judge. Within two years, she would join the Polish resistance and be honored by General Stefan Rowecki, commander of the Home Army, the largest resistance organization in occupied Poland, for her bravery. Within three years, she would hand him over to the Nazi secret police, the Gestapo. Her name was Blanka Kaczorowska.
Blanka Kaczorowska was born on October 13, 1922, in Brest Litovsk, known today as Brest in Belarus, then part of the Polish Republic. Her father, Jan Kaczorowski, belonged to a noble family in the settlement of Husiatyn in the Podolia region. He studied at the Saint Petersburg Technical University, volunteered for the Russian army during World War I, and after the war joined the newly independent Polish state, working his way up in the military legal system until he qualified in 1931 as an investigating judge. Between 1934 and 1938, he headed the local military court in Siedlce, east of Warsaw. The family was respected, patriotic, and widely connected within prewar Polish state institutions.
Blanka grew up in this environment. She attended the Military Family Association school in Warsaw, then the Queen Jadwiga Secondary School of Natural Sciences in Siedlce. She was a member of the Polish Scouting Association, which instilled in her early the values of patriotism and organizational discipline. When World War II broke out on September 1, 1939, with the German invasion of Poland, she had not yet finished her final school examinations. At the time, she was only 16 years old.
The German occupation of Poland, which followed the invasion within weeks, divided the country into different administrative zones. The city of Siedlce fell within the General Government, the German colonial administration established over central and southern occupied Poland. Under occupation, secret resistance organizations formed quickly, drawing on prewar civil society and military structures. As early as 1940, Kaczorowska was in contact with the underground and joined the structures of the Union of Armed Struggle, the predecessor organization of the Home Army (Armia Krajowa).
She worked in the kitchen of a German airfield, then as a cleaner in a German military hospital, jobs that gave her access to information of intelligence value. During this period, she caught the attention of a German officer in the Luftwaffe named Johannes Barand, and her resistance superiors encouraged her to exploit this connection as a source of information. In November 1941, the Gestapo arrested her in Siedlce. Incriminating materials were seized from her, including private letters from Barand. She was released a few days later, explaining to the resistance that she had convinced the Germans the materials had been found by chance during cleaning.
Within the underground, this explanation was accepted, and she was awarded the Cross of Valor — ironically, by order of General Rowecki, whom she would later betray and hand over to the Gestapo. At the ceremony confirming her award, she met Ludwik Kalkstein for the first time, the man who would seal her fate. Kalkstein was an intelligence officer in the Home Army, leading the so-called Group H, a network operating under Home Army command. He received his award at the same ceremony as Kaczorowska. In early 1941 and 1942, she joined his group. Ludwik Kalkstein was her superior in the underground, and their relationship quickly deepened.
In late March or early April 1942, the Gestapo arrested him and held him at its headquarters on Szucha Street in Warsaw. He collapsed during interrogation and agreed to cooperate. After his release in August 1942, he changed his appearance and searched for Kaczorowska, finding her a month later. He told her plainly that he had been released in exchange for agreeing to work for the Germans, and she raised no objection.
On November 14, 1942, they married in a church in Radość, a suburb east of Warsaw. The marriage was kept secret from the underground. Kaczorowska continued working in resistance organizations under her maiden name and kept a separate address from her husband so that her connection to him would not be discovered. In secret meetings with Kalkstein, she told him everything: the names of people she worked with, the missions she was assigned, and the identities of her organizational contacts. This information reached the Gestapo through Kalkstein, where she was registered as agent V-98. Kalkstein carried the number V-97. The third member of that network, Kalkstein's brother-in-law Eugeniusz Świerczewski, operated under the number V-100.
The consequences for the Polish resistance were severe. Kaczorowska later admitted in her postwar testimony that she knew the information she passed to her husband was reaching the Gestapo. In the summer of 1943, her capacity to do harm increased when she was assigned to Home Army headquarters. She used this position to obtain information for the Gestapo, and in December 1943, the information she provided directly led to the arrest of at least 14 resistance members, five of whom were later executed. Among the dead was Jadwiga Karaszewska, head of the propaganda and morale section in the Bureau of Studies and Kaczorowska's direct superior.
But the most dangerous act of betrayal occurred months earlier. On June 30, 1943, General Stefan Rowecki, commander of the Home Army, was arrested at his safe house in Warsaw and later executed. After an investigation lasting several months, Home Army counterintelligence concluded that three agents — Kalkstein, Kaczorowska, and Świerczewski — bore collective responsibility, and according to some sources, a secret military court sentenced all three to death in absentia. The sentence was carried out on Świerczewski, identified as the man who had pinpointed Rowecki's location in the street and informed the Germans, in June 1944. An assassination squad went looking for Kalkstein and Kaczorowska at their apartment on Sniadeckich Street in Warsaw but failed to find them.
Kaczorowska, pregnant at the time, had taken refuge in a hospital under German protection. She gave birth to a son, and in April 1944, Kalkstein moved her to the town of Piastów outside Warsaw. The marriage did not last, and the couple separated shortly after their son's birth. The sentence was never carried out, and Kaczorowska survived the following months under German protection.
In January 1945, as Soviet forces approached and German occupation structures collapsed, Kaczorowska and Kalkstein went to the recently liberated city of Łódź. Probably in February 1945, Kaczorowska left Łódź for Siedlce, her last prewar place of residence, to obtain official documents. At the local municipal office, she obtained the necessary document in her maiden name. At the same time, she did not hide the fact of her marriage. Her father, Jan Kaczorowski, the prewar military judge, had by then been recruited by the new communist authorities and appointed a judge on the Supreme Military Court in Lublin. This position, held by a senior judicial figure in the new state apparatus, gave Blanka a degree of protection that she exploited to the fullest in the turbulent early postwar years in Poland.
She settled in Łódź and obtained her secondary school completion certificate in July 1945, after finishing her interrupted education in an intensive course. On October 31, 1945, she enrolled in the art history department at the University of Łódź. In her application, she stated that she was married but did not mention her husband's surname. At university, she was not a distinguished student, caused no problems, and graduated with a clear good conduct record. She also entered into a relationship with Roman Vogel, also known as Roman Rawicz, a military judge who served in the same department of the Supreme Military Court as her father and co-authored a postwar commentary on military criminal law. She moved in with him and presented him as her husband, though they never formally married.
During the late 1940s, Kaczorowska lived a quiet life in Łódź, then later in Warsaw, where she completed her university studies, and in 1949 she found work at the State Institute for the Study of Folk Arts in Warsaw. On the surface, she had completely reinvented herself, but it did not last. The political climate in Poland was changing. The Stalinist tightening of communist control in the early 1950s brought intensified scrutiny of wartime records and renewed interest in former Gestapo collaborators. The protective network around Kaczorowska began to erode. Her father was discharged from military service in April 1948, and her partner Vogel came under increasing political pressure.
In late December 1952, she was arrested. Her apartment was searched, and a formal investigation was opened against her. She gave lengthy testimony describing her wartime activities in detail, attempting to minimize her personal responsibility, claiming she had trusted Kalkstein, denying direct cooperation with the Gestapo, and insisting she had spoken to her husband only about her work. On June 12, 1953, she was tried before the Regional Court in Warsaw. The charge was collaboration with the Nazi occupation under the decree of August 31, 1944, on the punishment of Hitlerite fascist criminals. The court convicted her and sentenced her to life imprisonment with permanent deprivation of civil rights. On appeal, the Supreme Court reduced the sentence to 15 years with deprivation of civil rights for 10 years. A judicial amnesty then reduced this to 12 years.
She served her sentence in the women's prison in Fordon, near Bydgoszcz in northern Poland, and was released on parole in July 1958, after five and a half years of detention. In prison, she became an informant for the communist security service, reporting on her fellow prisoners. After her release, she continued this role, working as a secret agent under the code name Katarzyna.
In 1968, she legally left Poland for Paris, where she initially worked on small art history projects, then as a caregiver and hotel receptionist. Her former husband, Ludwik Kalkstein, was arrested after the war and sentenced to prison for his collaboration with the communists during the war. After his release, he left Poland and eventually moved to France, where their son was living. Under a false identity, he spent the rest of his life in Western Europe and died in 1994.
In 1983, Kaczorowska was admitted to a Polish charitable care home in La Haye-aux-Faits, in the Loire Valley, which had cared since 1957 for veterans of the Polish Armed Forces in the West and political refugees. She was identified there by chance when a Polish woman working in the administration found her French residence card, which described her as a victim of a political trial in communist Poland. Her wartime past was soon exposed. She lost her position, and after reaching retirement age, Kaczorowska was moved to a French care home in Pougues-les-Eaux, north-central France, where she spent the rest of her life.
Blanka Kaczorowska — a woman who was perhaps worse than the Nazis themselves for betraying her country twice — died on August 25, 2002, at the age of 79, in a hospital run by the Camillian Fathers in Bry-sur-Marne, a suburb east of Paris. She was buried in the local municipal cemetery.