Columbia subject headings:
Communism--Great Britain--History--20th century.
Trotsky, Leon, 1879-1940.
Harvard subject headings:
Communism--Great Britain--History--20th century
Trotsky, Leon, 1879-1940
Princeton subject headings:
Communism--Great Britain--History--20th century.
Trotsky, Leon, 1879-1940.