Göring transferred authority over the  Gestapo  ( Geheime Staatspolizei )—the Prussian  secret police —to Himmler, who was also named chief of all German police outside  Prussia . On 22 April 1934, Himmler named Heydrich the head of the  Gestapo . Heydrich continued as head of the Sicherheitsdienst  (SD: security service) ,