Columbia subject headings:
Communism--History--20th century.
Soviet Union--Politics and government--1917-1936.
Stalin, Joseph, 1878-1953.
Statesmen--Soviet Union--Biography.
Trotsky, Leon, 1879-1940.
Harvard subject headings:
Communism--History--20th century
Soviet Union--Politics and government--1917-1936
Stalin, Joseph, 1878-1953
Statesmen--Soviet Union--Biography
Trotsky, Leon, 1879-1940
Princeton subject headings:
Communism--History--20th century.
Soviet Union--Politics and government--1917-1936.
Stalin, Joseph, 1878-1953.
Statesmen--Soviet Union--Biography.
Trotsky, Leon, 1879-1940.