Columbia subject headings:
Chile--Politics and government--1970-1973.
Labor unions--Chile--History--20th century.
Unidad Popular.
Working class--Political activity--Chile--History--20th century.
Harvard subject headings:
Chile--Politics and government--1970-1973.
Labor unions--Chile--History--20th century.
Political parties--Chile--History--20th century.
Social movements--Chile--History--20th century.
Unidad Popular.
Working class--Political activity--Chile--History.
Working class--Political activity--History--Chile--Political activity--History--20th century.
Princeton subject headings:
Chile--Politics and government--1970-1973.
Labor unions--Chile--History--20th century.
Unidad Popular.
Working class--Political activity--Chile--History--20th century.