Columbia subject headings:
Harvard subject headings:
Labor movement--Europe--History
Labor movement--United States--History
Labor unions--Europe--History
Labor unions--United States--History
Social conflict--Europe.
Syndicalism--Europe.
Princeton subject headings:
Labor movement--Europe--History.
Labor movement--United States--History.
Labor unions--Europe--History.
Labor unions--United States--History.
Social conflict--Europe.
Syndicalism--Europe.