Stella Kübler Stella { Goldschlag } Kübler Isaacksohn ( born 10 July 1922 ) , was a Jewish woman born in Germany who collaborated with the Gestapo during World War II , exposing and denouncing Berlin ' s underground Jews . Early life . She was born Stella Goldschlag and raised in Berlin as the only child in a middle - class , assimilated Jewish family . After the seizure of power by the Nazis , she , like other Jewish children , was forbidden to go to public school , so she attended Goldschmidt , a school set up by the Jewish community , where she was known for her beauty and vivacity . Her parents attempted to leave Germany to escape the Reich , but were unable to get visas for other countries . The family fell on hard times when Jews were purged from positions of influence and her father lost his job with the newsreel company Gaumont . After Stella completed her education she trained as a fashion designer at the School of Applied Art in Nurnbergerstrasse . Going underground and collaboration . In 1941 , she married a Jewish musician , Manfred Kübler . They had met when both were working as Jewish forced - labourers in a war plant in Berlin . In about 1942 , when the large deportation programme of Berlin Jews into extermination camps began , she disappeared underground , using forged papers to pass as a non - Jew — an endeavour which was helped by her blonde - haired , blue - eyed , classically beautiful , ' Aryan ' appearance . In the spring of 1943 , she and her parents were arrested by the Nazis , but to avoid deportation for herself and her parents , agreed to become a " catcher " for the Gestapo , hunting down Jews hiding as non - Jews ( referred to as " U - Boats " ) . She proceeded to comb Berlin for such Jews and , as she was familiar with a large number of Jewish people from her years at her segregated Jewish school , Kübler was very successful at finding her former schoolmates and handing their information over to the Gestapo , while pretending to be a U - Boat herself . The data concerning the number of her victims varies , depending on different sources of information , from between 600 to 3 , 000 Jews . Kübler ' s charisma and striking good looks were a great advantage in her pursuit of underground Jews . The Nazis called her " blonde poison " . She is mentioned in " The Forger " , Cioma Schonhaus ' 2004 account of living as an underground Jew in Berlin , and also " Berlin at War " ( Roger Moorhouse , 2010 ) . Despite her collaboration , the Nazis eventually deported her parents to a concentration camp , where they were killed . Her husband was deported in 1943 to Auschwitz , along with his family . This did not prevent Kübler from continuing her work as a Catcher for the Gestapo . She continued this work until March 1945 . During this time , she met and married Rolf Isaaksohn , also Jewish . Post - war . At the end of the war she went into hiding , but was found and arrested by the Soviets in October 1945 and sentenced to ten years ' camp detention . Afterwards she moved to West Berlin . There she was again tried and convicted , and punished with ten years ' detention . However she did not have to serve that sentence because of time already served in the Soviet prison . In 1992 , Peter Wyden , a Berlin schoolmate whose family had been able to get visas for the US in 1937 and who later learned about Stella ' s role as a Catcher while he was working for the U . S . Army , wrote a biography of Kübler .