Columbia subject headings:
Communism--Soviet Union--History--Sources.
Communists--Italy--Biography.
Italians--Soviet Union--Biography.
Soviet Union--Social conditions--Sources.
Harvard subject headings:
Communism--Soviet Union--History--Sources.
Communists--Italy--Biography
Italians--Soviet Union--Biography.
Soviet Union--Social conditions--1917-1945--Sources.
Princeton subject headings:
Communism--Soviet Union--History--20th century--Sources.
Communists--Italy--Biography.
Italians--Soviet Union--Biography.
Soviet Union--Social conditions--Sources.