One of the principles of the "Grupo Cine Liberación" was to produce anonymous films, in an endeavour to favorite collective creation processes, to create a collective discourse, and also to protect themselves from political repression. According to Lucio Mufud, the collective authorship movement of the 1960s and 1970s was "among other things, about erasing any authorial mark. It concerned itself, on the one hand, with protecting the militant creators from state repression. But it was also about having their voice coincide with the 'voice of the people.'" Another similar group included the "Grupo Cine de la Base" (The Base Film Group), which included the film director Raymundo Gleyzer, who produced "Los Traidores" (The Traitors, 1973), and was later "disappeared" during the dictatorship.