- Spies[remove]41
- Espionage11
- Espionage, Soviet7
- Intelligence service6
- Defectors4
- World War, 1939-19453
- Communism2
- Communist strategy2
- Espionage, British2
- Secret service2
- Statesmen2
- Wolf, Markus, 1923-2
- Art historians1
- Blunt, Anthony, 1907-19831
- Counterrevolutions1
- Dansey, Claude Edward Marjoribanks, Sir, 1876-19471
- Espionage, Czechoslovak1
- Gast, Gabriele, 1943-1
- Gay men1
- Germany (East)1