Columbia subject headings:
Soviet Union--Politics and government--1917-1936.
Trotsky, Leon, 1879-1940.
Harvard subject headings:
Kommunisticheskaia partiia Sovetskogo Soiuza--History.
Soviet Union--Politics and government--1917-1936.
Trotsky, Leon, 1879-1940
Princeton subject headings:
Soviet Union--Politics and government--1917-1936.
Trotsky, Leon, 1879-1940.