Under the German commander Reinhard Heydrich, the SD became increasingly influential. In Amsterdam the SD headquarters were on the Euterpestraat in the building now used for the Gerrit van der Veenschool. Prisoners were tortured during interrogations at these premises. If they survived the interrogations, they would be sent to the Scheveningen prison, camp Amersfoort or the prison barracks at Westerbork concentration camp. In some cases the local chapters (Aussenstellen) of the SD and the Sipo operated quite independently from the SD leadership.
The Sicherheitsdienst (SD) was established in 1931 as the security and information service of the SS.