Columbia subject headings:
Argentina--Politics and government--1943-1955.
Labor unions--Argentina--History.
Syndicalism--Argentina.
Harvard subject headings:
Labor unions--Argentina--History
Labor unions--Argentina--Political activity--History.
Working class--Argentina--Political activity--History.
Princeton subject headings:
Labor movement--Argentina--Political activity--History.
Labor unions--Argentina--History.
Labor unions--Argentina--Political activity--History.