Columbia subject headings:
Harvard subject headings:
Communism--Great Britain--History--20th century
Labour Party (Great Britain)--History--20th century.
Socialism--Great Britain--20th century.
Socialism--Great Britain--History--20th century
Princeton subject headings:
Communism--Great Britain--History--20th century.
Labour Party (Great Britain)--History--20th century.
Socialism--Great Britain--History--20th century.