Columbia subject headings:
Labor unions--Germany--History.
Labor unions--Political activity--Germany--History.
Harvard subject headings:
Labor unions--Germany (West)--History
Labor unions--Germany--History
Labor unions--Germany--Political activity--History.
Labor unions--Political activity--Germany--History.
Princeton subject headings:
Labor unions--Germany (West)--History.
Labor unions--Germany--History.
Labor unions--Germany--Political activity--History.