Establishment of the Reich Security Main Office

On September 22, 1939, the SD (Security Service) and Sipo (the Security Police) merged and became the Reich Security Main Office (RSHA). Under the command of Heydrich, the RSHA evolved between 1939 and 1941 into a mammoth organization that eventually included seven departments: Personnel; Organization and Law; Internal Affairs; Gestapo; Criminal Police (Kripo); Intelligence; and, Ideological Affairs.