Columbia subject headings:
African American labor union members--Texas--Houston.
Hughes Tool Company.
Independent Metal Workers Union.
Race discrimination--Law and legislation--United States.
Tool and die makers--Labor unions--Texas--Houston.
Harvard subject headings:
African Americans--Civil rights
African Americans--Employment
Hughes Tool Company.
Labor movement--Texas--History--20th century.
Labor unions--Texas--History--20th century.
Princeton subject headings:
African Americans--Civil rights.
African Americans--Employment.
Hughes Tool Company.
Labor movement--Texas--History--20th century.
Labor unions--Texas--History--20th century.