Columbia subject headings:
Harvard subject headings:
American literature--20th century--History and criticism
Authors, American--20th century--Political and social views
Communism and literature
Communism and literature--United States--History--20th century
Farrell, James T. (James Thomas), 1904-1979--Criticism and interpretation.
Right and left (Political science) in literature
Sinclair, Upton, 1878-1968--Criticism and interpretation.
Princeton subject headings:
American literature--20th century--History and criticism.
Authors, American--20th century--Political and social views.
Communism and literature.