Columbia subject headings:
Harvard subject headings:
Katayama, Sen, 1859-1933.
Labor movement--Japan--History
Labor unions--Japan--Officials and employees--Biography.
Socialists--Japan--Biography
Princeton subject headings:
Katayama, Sen, 1859-1933.
Labor movement--Japan--History.
Labor unions--Japan--Officials and employees--Biography.
Socialists--Japan--Biography.