11. SIM (Spain)
The Servicio de Información Militar (SIM) was the secret police of the Spanish Republican Armed Forces during the Spanish Civil War (1936-1939). Established in August 1937, SIM’s primary functions included combating espionage, preventing sabotage, and maintaining internal security within the Republican zone. However, it became notorious for its brutal tactics, including arbitrary arrests, torture, and extrajudicial executions, leading to a climate of fear among both military personnel and civilians. Its controversial legacy continues to be a subject of historical debate.
