Columbia subject headings:
Harvard subject headings:
Labor unions and fascism--Germany--Congresses.
Labor unions and international relations--Germany--History--20th century--Congresses.
Labor unions--Germany--History--20th century--Congresses.
Labor unions--Political activity--Germany--History--20th century--Congresses.
National socialism--Congresses.
Princeton subject headings:
Labor unions and fascism--Germany.
Labor unions--Germany--History--20th century.
Labor unions--Political activity--Germany--History--20th century.
National socialism.