Columbia subject headings:
Communists--United States--Biography.
Foster, William Z., 1881-1961.
Labor unions--United States--Biography.
Working class--United States--Biography.
Harvard subject headings:
Communists--United States--Biography
Foster, William Z., 1881-1961.
Labor unions--United States--Biography.
Working class--United States--Biography
Princeton subject headings:
Communists--United States--Biography.
Foster, William Z., 1881-1961.
Labor leaders--United States--Biography.
Labor unions--United States--Biography.