Columbia subject headings:
Harvard subject headings:
Church and state--Orthodox Eastern Church
Church and state--Soviet Union
Communism and Christianity--Orthodox Eastern Church--History.
Communism and Christianity--Soviet Union--History.
Orthodox Eastern Church--Soviet Union.
Persecution--Soviet Union--History--20th century.
Russkai︠a︡ pravoslavnai︠a︡ t︠s︡erkovʹ
Soviet Union--Church history.
Princeton subject headings:
Church and state--Soviet Union--History--20th century.
Russkai︠a︡ pravoslavnai︠a︡ t︠s︡erkovʹ--Soviet Union--History--20th century.