Columbia subject headings:
Labor unions--Political activity--Great Britain.
Labour Party (Great Britain)
Labour Party (Great Britain)--History.
Harvard subject headings:
Labor unions--Political activity--Great Britain--History
Labor unions--Political activity--Great Britain--History.
Labour Party (Great Britain)--History--20th century.
Princeton subject headings:
Labor unions--Political activity--Great Britain--History.
Labour Party (Great Britain)--History--20th century.