The Gestapo (help·info) (contraction of Geheime Staatspolizei: "Secret State Police") was the official secret police of Nazi Germany. Uner the overall administration of the Schutzstaffel (SS), it was administered by the Reichssicherheitshauptamt (RSHA) ("head office of the Reich's security service") and was considered a dual organization of the Sicherheitsdienst (SD) ("security service") and also a suboffice of the Sicherheitspolizei (SIPO) ("security police").