Seixas Santos was one of the directors of "As Armas e o Povo" (1975), directed by a group of film-makers, which portraits the week between the 25 April and the 1 May, 1974. Following the same political line, sign another collective film "A Lei da Terra" (1976), shown in the Leipzig Film Festival. During the same year, was nominated the president of the Portuguese Film Institute. He was one of the founders of "Grupo Zero", an organization which had illustrious members such as João César Monteiro, Jorge Silva Melo, Ricardo Costa, Margarida Gil, Solveig Nordlund and the cinematographer Acácio de Almeida.