Columbia subject headings:
Atheism--Soviet Union--History--20th century.
Persecution--Soviet Union--History--20th century.
Soviet Union--Religion.
Harvard subject headings:
Atheism--Soviet Union--History--20th century.
Persecution--Soviet Union--History--20th century.
Soviet Union--Religion.
Princeton subject headings:
Atheism--Soviet Union--History--20th century.
Persecution--Soviet Union--History--20th century.
Soviet Union--Religion.