Spies History 36 Secret service 22 Espionage, Soviet 19 World War, 1939-1945 10 Espionage 8 World War, 1914-1918 6 more ... Foreign relations 5 International relations 5 Officials and employees 5 Politics and government 5 Cold War 4 Communism 4 Gay men 4 Intelligence service 4 Art historians 3 Military intelligence 3 Subversive activities 3 Anti-communist movements 2 Biography 2 Communists 2 Cryptography 2 Espionage, American 2 Espionage, British 2 Female impersonators 2 Germans 2 Manners and customs 2 Political refugees 2 Social life and customs 2 Soldiers 2 less ...