Columbia subject headings:
Espionage, Soviet--History.
Intelligence service--Soviet Union--History.
Soviet Union. Komitet gosudarstvennoĭ bezopasnosti--History.
Harvard subject headings:
Espionage, Soviet--History.
Intelligence service--Soviet Union--History.
Soviet Union. Komitet gosudarstvennoĭ bezopasnosti--History.
Princeton subject headings:
Espionage, Soviet--History.
Intelligence service--Soviet Union--History.
Soviet Union. Komitet gosudarstvennoĭ bezopasnosti--History.