The Sicherheitsdienst (SD) | Holocaust Encyclopedia
https://encyclopedia.ushmm.org/content/en/article/the-sicherheitsdienst-sd
The Sicherheitsdienst (Security Service), usually called the SD, was a Nazi intelligence agency. The SD existed from 1931 to 1945. For most of this period, it was led by Reinhard Heydrich. The SD was an ideologically radical organization that became a key perpetrator of the Holocaust.. The SD was a subgroup of the SS (Schutzstaffel, Protection Squadron), the Nazi Party’s elite …
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