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Subject
- History17
- Internal security10
- Politics and government6
- Secret service6
- Intelligence service5
- National security4
- Soviet Union. Narodnyĭ komissariat vnutrennikh del4
- Soviet Union. Komitet gosudarstvennoĭ bezopasnosti3
- World War, 1939-19453
- Geopolitics2
- History of Russia. Soviet Union. Former Soviet Republics2
- Intelligence officers2
- Official secrets2
- Political persecution2
- Soviet Union. Obʺedinennoe gosudarstvennoe politicheskoe upravlenie2
- Terrorism2
- World War (1939-1945)2
- Armed Forces1
- Censorship1
- Church and state1