SD (Sicherheitsdienst)

The intelligence service of the NSDAP under SS control (1931-1945), the SD (Sicherheitsdienst, literally Security Service) was responsible for intelligence gathering about perceived enemies of the NSDAP, including political opponents, Jews and others. Led by Reinhard Heydrich from its establishment in 1931, the SD was initially one of several intelligence services operating in Germany. In 1934, the SD was named the sole intelligence agency of Nazi Germany.

See also Police in the Nazi State.