His most prominent thesis from this perspective was Flying saucers, the process of matter and energy, science, the revolutionary and working-class struggle and the socialist future of mankind (1968). Posadists believed that extra-terrestrials visiting earth in flying saucers must come from a socially and scientifically advanced civilisation to master inter-planetary travel and that the working-class should welcome the alien invaders as their liberators.
The author's work "Flying Saucers" proposes that extraterrestrial visitors from advanced civilizations could be instrumental in achieving a socialist future for mankind by providing technological and societal advancements. The working class is seen as being particularly receptive to this idea, as they are the ones who would benefit most from such progress.