Columbia subject headings:
Catholic Church--Communist countries.
Christianity and politics--History--20th century.
Church and state--Communist countries.
Communism and Christianity--Catholic Church.
Communist countries--Church history.
Harvard subject headings:
Catholic Church--Communist countries.
Christianity and politics--History--20th century
Church and state--Communist countries.
Communism and Christianity--Catholic Church.
Communist countries--Church history.
Princeton subject headings:
Catholic Church--Communist countries.
Christianity and politics--History--20th century.
Church and state--Communist countries.
Communism and Christianity--Catholic Church.
Communist countries--Church history.