Spies History 65 Secret service 31 Espionage, Soviet 27 World War, 1939-1945 14 Espionage 13 Intelligence service 12 more ... Intelligence officers 10 Officials and employees 10 Cold War 9 Espionage, German 7 Foreign relations 7 International relations 6 Communism 5 Communists 5 Espionage, British 5 Journalists 5 Soldiers 5 Assassination 4 Gay men 4 Military intelligence 4 Politics and government 4 Subversive activities 4 Women spies 4 Art historians 3 Biography 3 Chemists 3 Prisoners 3 Relations 3 Underground movements 3 less ...