Columbia subject headings:
Dissenters, Religious--Soviet Union--History--20th century.
Orthodox Eastern Church--Soviet Union--History--20th century.
Persecution--Soviet Union--History--20th century.
Russkai︠a︡ pravoslavnai︠a︡ t︠s︡erkovʹ--History--20th century.
Soviet Union--Church history.
Harvard subject headings:
Dissenters, Religious--Soviet Union--History--20th century.
Orthodox Eastern Church--Soviet Union--History--20th century.
Persecution--Soviet Union--History--20th century.
Russkai︠a︡ pravoslavnai︠a︡ t︠s︡erkovʹ--History--20th century.
Soviet Union--Church history.
Princeton subject headings:
Dissenters, Religious--Soviet Union--History--20th century.
Orthodox Eastern Church--Soviet Union--History--20th century.
Persecution--Soviet Union--History--20th century.
Russkai︠a︡ pravoslavnai︠a︡ t︠s︡erkovʹ--History--20th century.
Soviet Union--Church history.