Columbia subject headings:
Kommunisticheskai͡a partii͡a Sovetskogo Soi͡uza--Purges.
Soviet Union--Politics and government--1936-1953.
Harvard subject headings:
Political purges--Soviet Union.
Soviet Union--Politics and government--1917-1936.
Soviet Union--Politics and government--1936-1953.
Princeton subject headings:
Kommunisticheskai︠a︡ partii︠a︡ Sovetskogo Soi︠u︡za--Purges--History.
Political purges--Soviet Union--History.
Soviet Union--Politics and government--1917-1936.
Soviet Union--Politics and government--1936-1953.