The Sicherheitspolizei , often abbreviated as SiPo, was a term used in Germany for security police. In the Nazi era, it was used to describe the state political and criminal investigation security agencies. It was made up by the combined forces of the Gestapo and the Kriminalpolizei between 1936 and 1939. As a formal agency, the SiPo was folded into the RSHA in 1939, but the term continued to be used informally until the end of World War II in Europe.
The term originated in August 1919 when the Reichswehr set up the Sicherheitswehr as a militarised police force to take action during times of riots or strikes. However owing to limitations in army numbers, it was renamed the Sicherheitspolizei to avoid attention. They wore a green uniform, and were sometimes called the "Green Police". It was a military body, recruiting largely from the Freikorps, with NCOs and officers from the old German Imperial Army.
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