Columbia subject headings:
Harvard subject headings:
Anti-communist movements--Germany--History--20th century--Congresses.
Germany--Politics and government--20th century
Germany--Politics and government--20th century--Congresses.
Labor movement--Germany--History--20th century--Congresses.
Socialism--Germany--20th century--Congresses.
Socialism--Germany--History--20th century--Congresses.
Working class--Germany--History--20th century--Congresses.
Princeton subject headings:
Anti-communist movements--Germany--History--20th century--Congresses.
Germany--Politics and government--20th century--Congresses.
Labor movement--Germany--History--20th century--Congresses.
Socialism--Germany--History--20th century--Congresses.
Working class--Germany--History--20th century--Congresses.