Columbia subject headings:
Catholic Church--Foreign relations.
Catholic Church--Political activity.
Communism and Christianity--Catholic Church.
Espionage, Soviet.
Fascism and the Catholic Church.
Harvard subject headings:
Catholic Church--Foreign relations.
Communism and Christianity--Catholic Church.
Fascism and the Catholic Church.
Spies--Vatican City.
Princeton subject headings:
Catholic Church--Foreign relations.
Catholic Church--Political activity.
Communism and Christianity--Catholic Church.
Espionage, Soviet.
Fascism and the Catholic Church.