Columbia subject headings:
African Americans--Civil rights.
African Americans--Employment.
Labor unions--United States.
United States--Race relations.
Working class--United States.
Harvard subject headings:
African Americans--Civil rights
African Americans--Employment
Labor movement--United States.
Labor unions--United States
United States--Race relations
Princeton subject headings:
African Americans--Civil rights.
African Americans--Employment.
Labor movement--United States.
Labor unions--United States.
United States--Race relations.