Columbia subject headings:
Communism--Canada--History--20th century.
Communists--Canada--Biography.
Subversive activities--Canada--History--20th century.
Trials (Espionage)--Canada--History--20th century.
World politics--1945-1989.
Harvard subject headings:
Communism--Canada--History--20th century.
Communists--Canada--Biography.
Subversive activities--Canada--History--20th century.
Trials (Espionage)--Canada--History--20th century.
World politics--1945-
World politics--1945-1989
Princeton subject headings:
Communists--Canada.
Subversive activities--Canada--History.
World politics--1945-1989.