Columbia subject headings:
Labor unions--Latin America--History--20th century.
Strikes and lockouts--Latin America--History--20th century.
Harvard subject headings:
Labor unions--Latin America--History--20th century.
Strikes and lockouts--Latin America--History--20th century.
Princeton subject headings:
Labor unions--Latin America--History--20th century.
Strikes and lockouts--Latin America--History--20th century.