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A secret police force is an informal term for a police organization that operates in secret to enforce state security.
In non-democratic countries, such as police states, dictatorships and totalitarian states, the secret police often uses violent methods to suppress sedition, dissent, or political opposition.
Nazi secret police forces:
Fascist secret police forces:
Secret police forces in communist states:
Middle-eastern secret police forces:
North American secret police forces:
Latin American secret police forces:
Caribbean secret police forces:
African secret police forces:
The secret police of late Imperial Russia was the Okhranka, whose stated goal was to ensure the security of the Tsar.
Before World War II, the German Nazis created the Sicherheitsdienst (SD) to control domestic opposition.
During World War II, the Soviet Union had a counter-espionage agency, Smersh.