Espionage, American History Foreign relations 23 Cold War 19 Intelligence officers 10 Spies 10 Intelligence service 8 more ... Secret service 8 World War, 1939-1945 6 Espionage, British 5 Military intelligence 5 Politics and government 5 Espionage, Soviet 4 National security 4 Subversive activities 4 American fiction 3 Autonomy and independence movements 3 English fiction 3 Espionage in literature 3 History and criticism 3 Military relations 3 Officials and employees 3 Spies in literature 3 Spy films 3 Spy stories, American 3 Spy stories, English 3 Air warfare 2 Americans 2 Anti-Nazi movement 2 Authors, American 2 less ...