In Spain, the ICO-affiliated Bloque Obrero y Campesino (BOC), led by Joaquin Maurin, was for a time larger and more important than the official Spanish Communist Party.
A Joaquin Mauri vezette NKE-s spanyol Bloque Obrero y Campesino (BOC) szintén egy ideig nagyobb és fontosabb volt a hivatalos Spanyol Kommunista Pártnál.