Columbia subject headings:
Harvard subject headings:
Radicalism--France
Radicalism--United States.
Social conflict--France.
Social conflict--United States.
Working class--France--Political activity.
Working class--Political activity--United States
Princeton subject headings:
Radicalism--France.
Radicalism--United States.
Social conflict--France.
Social conflict--United States.
Working class--Political activity--United States.