Columbia subject headings:
Christianity and politics--Catholic Church--History--20th century.
Communism and Christianity--Catholic Church.
Europe--Politics and government--1945-
Papacy--History--1929-1945.
Pius XII, Pope, 1876-1958.
Harvard subject headings:
Christianity and politics--Catholic Church--History--20th century
Communism and Christianity--Catholic Church.
Europe--Politics and government--1945-
Papacy--History--1929-1945
Pius XII, Pope, 1876-1958.
Princeton subject headings:
Christianity and politics--Catholic Church--History--20th century.
Communism and Christianity--Catholic Church.
Europe--Politics and government--1945-
Papacy--History--1929-1945.
Pius XII, Pope, 1876-1958.