Columbia subject headings:
Harvard subject headings:
Communism--Soviet Union--History--20th century.
Communists--Soviet Union--Biography
Revolutionaries--Soviet Union--Biography
Trotsky, Leon, 1879-1940
Princeton subject headings:
Communism--Soviet Union--History--20th century.
Communists--Soviet Union--Biography.
Revolutionaries--Soviet Union--Biography.
Trotsky, Leon, 1879-1940.