Key term for OCR GCSE History B, used in Control and Opposition, 1933–1939.
The intelligence-gathering branch of the SS, responsible for spying on citizens and identifying political opponents.
Sicherheitsdienst (SD) appears in OCR GCSE History B revision content for Living under Nazi Rule (1933–1945), especially Control and Opposition, 1933–1939 and Machinery of terror.
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