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Subject
- History151
- Foreign relations112
- Politics and government95
- Soviet Union. Komitet gosudarstvennoĭ bezopasnosti84
- Secret service76
- Spies76
- World War, 1939-194570
- Intelligence service66
- Espionage, Soviet46
- Communism44
- Espionage44
- Diplomatic relations36
- World War (1939-1945)30
- United States. Central Intelligence Agency21
- Defectors19
- Social conditions19
- Soviet Union. Obʺedinennoe gosudarstvennoe politicheskoe upravlenie19
- Underground movements17
- Cold War16
- Intelligence officers16