Columbia subject headings:
Harvard subject headings:
Communism--Italy--History
Espionage--Italy--History.
Espionage--Soviet Union--History.
Secret service--Soviet Union--History
Soviet Union. Komitet gosudarstvennoĭ bezopasnosti.
Princeton subject headings:
Communism--Italy--History.
Espionage--Italy--History.
Espionage--Soviet Union--History.
Secret service--Soviet Union--History.
Soviet Union. Komitet gosudarstvennoĭ bezopasnosti