Columbia subject headings:
Labor movement--Argentina--History--20th century.
Labor unions--Political activity--Argentina--History--20th century.
Syndicalism--Argentina--History--20th century.
Harvard subject headings:
Labor unions--Political activity--Argentina--History--20th century
Syndicalism--Argentina--History--20th century.
Working class--Argentina--Political activity--History--20th century.
Princeton subject headings:
Labor movement--Argentina--Political activity--History--20th century.
Labor unions--Political activity--Argentina--History--20th century.
Syndicalism--Argentina--History--20th century.