Columbia subject headings:
Radicalism.
Theater and society--History--20th century.
Theater--History--20th century.
Theater--Political aspects.
Harvard subject headings:
Radicalism.
Theater and society--History--20th century.
Theater--History--20th century.
Theater--Political aspects.
Princeton subject headings:
Radicalism.
Theater and society--History--20th century.
Theater--History--20th century.
Theater--Political aspects.