The Gestapo was the official secret police of NaziGermany. Beginning in April 1934, it was under the administration of the SS leader Heinrich Himmler in his position as Chief of German Police. From September 1939 forward it was administered by the Reichssicherheitshauptamt (RSHA) ("Reich Main Security Office") and was considered a sister organization of the Sicherheitsdienst (SD) ("Security Service") and also a suboffice of the Sicherheitspolizei (SiPo) ("security police").
The duties of the Gestapo included inspecting the bloodlines of supposedly solid Reich citizens for tainted genetics. In 1962, officers of the Gestapo focused on the family of Reich Rocket Force Colonel Johannes Drucker, whose wife Käthe was accused having a Jewish grandmother.