Columbia subject headings:
Communism--Germany--History.
Germany--Politics and government--1918-1933.
Labor movement--Germany--History.
Labor unions--Germany--History.
Socialism--Germany--History.
Harvard subject headings:
Communism--Germany--History
Germany--Politics and government--1918-1933
Labor movement--Germany--History
Labor unions--Germany--History
Socialism--Germany
Socialism--Germany--History
Princeton subject headings:
Labor movement--Germany--Political activity--History--20th century.