Columbia subject headings:
Motion pictures--Political aspects--United States--History--20th century.
Harvard subject headings:
Motion pictures--Political aspects--United States--History--20th century.
Motion pictures--Social aspects--United States--History--20th century.
Politics in motion pictures.
Socialism and motion pictures--United States.
Princeton subject headings:
Motion pictures--Political aspects--United States--History--20th century.
Motion pictures--Social aspects--United States--History--20th century.
Politics in motion pictures.
Socialism and motion pictures--United States.