Spies History 137 Secret service 62 Espionage, Soviet 38 World War, 1939-1945 35 Espionage 27 Intelligence service 20 more ... Cold War 10 Communism 10 Intelligence officers 10 Officials and employees 10 Women spies 9 Espionage, German 8 Military intelligence 8 World War, 1914-1918 8 Foreign relations 7 Journalists 7 Politics and government 7 Espionage, British 6 International relations 6 Subversive activities 6 Underground movements 6 Assassination 5 Communists 5 Soldiers 5 Biography 4 Cryptography 4 Espionage, American 4 Gay men 4 Germans 4 less ...