Columbia subject headings:
Confederación de Trabajadores de México--History.
Labor unions--Mexico--History--20th century.
Harvard subject headings:
Confederación de Trabajadores de México--History.
Labor unions--Mexico--History--20th century.
Princeton subject headings:
Confederación de Trabajadores de México--History.
Labor movement--Mexico--History--20th century.
Labor policy--Mexico--History--20th century.
Labor unions--Mexico--History--20th century.
Working class--Mexico--Political activity--History--20th century.