Columbia subject headings:
Harvard subject headings:
Cold War.
Espionage, Soviet--Germany (West)
Secret service--Soviet Union
Soviet Union. Komitet gosudarstvennoĭ bezopasnosti.
Princeton subject headings:
Cold War.
Espionage, Soviet--Germany (West).
Secret service--Soviet Union.
Soviet Union. Komitet gosudarstvennoĭ bezopasnosti