However, when during the May 1957 annual Carlist Montejurra amassment his son, Carlos Hugo, made a fulminant Principe de Asturias entry greeted by exploding enthusiasm of the youth, the supporters of Don Juan mounted a counter-action.
On 9 May 1976 during the Spanish Transition, far right-wing gunmen supported by the Spanish secret services, killed two people at the Carlist Party celebration.