The Schutzstaffel (German for "Protective Corps," often abbreviated SS) was an elite paramilitary unit of the German Nazi party. It was formed from the ranks of the SA in 1925 to be Adolf Hitler's personal guard and to guard NSDAP meetings. On January 6, 1929 Hitler appointed Heinrich Himmler as the leader of the SS, which then had only 280 people among its ranks. With Hitler's approval Himmler built up the SS and by the end of 1932 the SS already had 52,000 members. After only a year the SS had over 209,000 members.
Before 1932 the SS wore the same uniform as the Sturmabteilung except for a black tie and a black cap with a death's head on it. After the introduction of the black uniform in 1932 they were often called "Black shirts".
Heinrich Himmler, together with his right-hand man Reinhard Heydrich, consolidated the power of the organisation. In 1931 Himmler gave Heydrich the assignment to build an intelligence service inside the SS, the Sicherheitsdienst.
By the time World War II began the number of members rose to 250,000 and the Waffen-SS was formed in December 1940 to fight alongside the Wehrmacht, Germany's regular military. The SS also received control of the Gestapo in 1936.
The SS evolved into a highly effective and deadly force during World War II. At its peak, its name and reputation for efficient and terrifying violence was enough to strike fear into the heart of anyone. Hitler gave the SS jurisdiction over all concentration camps and allowed them to oversee the day-to-day control of all countries conquered by Germany during the war.
See also: Praetorian Guard