"Fiestas del Pilar" was the name of the label that identified a can preserved in the Fotofilm laboratory during the seventies. In fact it was a false title, invented to protect what it contained: a clandestine film. It was not the only one, there were many more. Almost fifty years later, some of their authors explain the stories of these films with political content that broke the topics of representation of the working class, registering a new ethical, aesthetic and cultural canon.