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Subject
- History65
- Secret service10
- Communism7
- Spies7
- World War, 1939-19457
- Revolution (Soviet Union : 1917-1921)6
- Allied Intervention in the Soviet Union (1918-1920)4
- Campaigns4
- Foreign relations4
- German Occupation of Soviet Union (1941-1944)3
- Revolutionaries3
- Underground movements3
- World War, 1914-19183
- Dzerzhinskiĭ, Feliks Ėdmundovich, 1877-19262
- Espionage2
- Espionage, British2
- Intelligence service2
- Politics and government2
- Prisons2
- Reilly, Sidney George, 1874-19252