Columbia subject headings:
Espionage--Soviet Union.
Intelligence service--Soviet Union.
Soviet Union--Politics and government.
Soviet Union. Komitet gosudarstvennoĭ bezopasnosti.
Harvard subject headings:
Espionage--Soviet Union.
Intelligence service--Soviet Union.
Soviet Union--Politics and government--1917-1936.
Soviet Union. Komitet gosudarstvennoĭ bezopasnosti.
Princeton subject headings:
Espionage--Soviet Union.
Intelligence service--Soviet Union.
Soviet Union--Politics and government.
Soviet Union. Komitet gosudarstvennoĭ bezopasnosti