Columbia subject headings:
African Americans--Economic conditions.
African Americans--Intellectual life.
African Americans--Politics and government.
Communism--United States.
Socialism--United States--History.
Harvard subject headings:
African Americans--Economic conditions
African Americans--Intellectual life
African Americans--Intellectual life--20th century
African Americans--Politics and government
Communism--United States
Socialism--United States--20th century.
Socialism--United States--History
Socialism--United States--History--20th century
Princeton subject headings:
African Americans--Economic conditions.
African Americans--Intellectual life.
African Americans--Politics and government.
Communism--United States.
Socialism--United States--History.