Columbia subject headings:
Kommunisticheskai͡a partii͡a Sovetskogo Soi͡uza--Purges--History.
Soviet Union--Politics and government--1917-1936.
Trotsky, Leon, 1879-1940.
Harvard subject headings:
Kommunisticheskai︠a︡ partii︠a︡ Sovetskogo Soi︠u︡za--Purges--History.
Soviet Union--Politics and government--1917-1936.
Trotsky, Leon, 1879-1940
Princeton subject headings:
Kommunisticheskai︠a︡ partii︠a︡ Sovetskogo Soi︠u︡za--History.
Soviet Union--Politics and government--1917-1936.
Trotsky, Leon, 1879-1940.