However, Carlos Hugo's deviations from traditional Carlist ideology—most notably his endorsement of Titoist socialism—caused many Carlists to question his leadership. Carlos Hugo sought to change the political direction of the Carlist movement through the Carlist Party, of which he was the official head during the 1976 Carlist gathering when the fatal Montejurra incident occurred, and at which Sixtus Henry was also present, leading opposition to his brother's reforms.