Helmut_Bischoff--Kurt_Gerstein

Helmut Hermann Wilhelm Bischoff (1 March 1908 – 5 January 1993) was a German SS-Obersturmbannführer, Gestapo officer and Nazi official. During World War II he was the leader of Einsatzkommando 1/IV in Poland and later headed the Gestapo offices in Poznań (Posen) and Magdeburg.
From 1943 to 1945 Bischoff served as a senior deputy to SS-Obergruppenführer Hans Kammler and was the chief of security for Germany's V-weapons program. He later commanded the Sicherheitsdienst (SD) at the Mittelbau-Dora concentration camp. Between 1967 and 1970 Bischoff was a defendant in the Essen-Dora war crimes trial.