Columbia subject headings:
Harvard subject headings:
Human rights movements.
Opposition (Social sciences)
Protest movements
Revolutions--20th century.
Riots--History--20th century.
Social movements
Socialism--20th century.
Princeton subject headings:
Human rights movements.
Opposition (Social sciences)
Protest movements.
Revolutions--20th century.
Riots--History--20th century.
Social movements.
Socialism--20th century.