Columbia subject headings:
Harvard subject headings:
Anarchists--Spain--Biography
Labor unions--Spain--Biography.
Álvarez de Sotomayor Gordillo y Aguilar, Nicasio, 1899-1936.
Princeton subject headings:
Álvarez de Sotomayor Gordillo y Aguilar, Nicasio, 1899-1936.
Labor unions--Spain--History.
Syndicalists--Spain--Biography.