Columbia subject headings:
Moscow Trials, Moscow, Russia, 1936-1937.
Trotsky, Leon, 1879-1940.
Harvard subject headings:
Moscow Trials, Moscow, Russia, 1936-1937.
Sedov, Lev, 1906-1938.
Soviet Union--Politics and government--1917-1936.
Trotsky, Leon, 1879-1940
Princeton subject headings: