Columbia subject headings:
Christianity--Russia (Federation)
Russia (Federation)--Church history.
Russkai︠a︡ pravoslavnai︠a︡ t︠s︡erkovʹ--History--20th century.
Harvard subject headings:
Christianity--Soviet Union
Church and state--Soviet Union
Russkai︠a︡ pravoslavnai︠a︡ t︠s︡erkovʹ--History--20th century.
Soviet Union--Church history.
Princeton subject headings: