Columbia subject headings:
Harvard subject headings:
Labor movement--Switzerland--History--20th century.
Political parties--Switzerland--History--20th century.
Switzerland--Politics and government--20th century.
Working class--Political activity--Switzerland--History--20th century.
Working class--Switzerland--Political activity--History--20th century.
Princeton subject headings:
Switzerland--History--20th century.
Switzerland--Politics and government--20th century.