During Transición Sáenz-Díez's Madrid house turned into headquarters of Traditionalism. One of his first initiatives was re-claiming the Montejurra gathering, controlled by the Progressists. In early 1976 he mobilized supporters to ensure highest attendance and co-financed logistics of the Sixtinos; during the very day he was also present at the place. The event, from the onset planned as a confrontation, resulted in 2 Progressists shot. The press communiqué released by Comunión lamented the deaths and claimed not to know where the gunshots had come from, denying that anyone accompanying Don Sixto had fired them. In a second and more detailed press comuniqué, Sixtinos claimed success, consisting of preventing a Marxist meeting and profanation of sacred Carlist site with separatist and subversive plot.