Columbia subject headings:
Harvard subject headings:
Labor policy--United States--History--20th century
Labor unions--Government policy--United States--History--20th century.
Labor unions--United States--Political activity--History--20th century.
New Deal, 1933-1939.
Princeton subject headings:
Labor policy--United States--History--20th century.
Labor unions--Government policy--United States--History--20th century.
Labor unions--United States--Political activity--History--20th century.
New Deal, 1933-1939.