Beginning in 1968, Posadas also became known for his theories concerning
UFOs and
extraterrestrial life. If anything like UFOs existed, they could demonstrate the existence of agents able to master a very sophisticated technology, something that would be compatible with what in this planet was advocated by
socialism. If UFOs existed, they could be allied in addressing some of the major problems in the earth. One of his most well-known works is a 1968 pamphlet called ''Les Soucoupes Volantes, le processus de la matiere et de l'energie, la science et le socialisme
(Flying Saucers, the process of matter and energy, science and socialism''). Here, he connects the existence of extraterrestrial life and UFOs to
communism. He argues that the UFOs being spotted at that time indicates the advancements of life in other planets and that that can be only possible due to communist ideologies. He also writes that capitalism tends to make people self-centered and focus on profits, rather than work on the scientific and civilizational progress of mankind. Since extraterrestrial beings have developed technology advanced enough to visit other planets, this indicates that they have surpassed the bane of a capitalistic society. Along with that, they have also surpassed their impulsion – the need to kill or control to assert dominance. Posadas shows enthusiasm to collaborate with extraterrestrial beings. He writes, "We must appeal to the beings on other planets, when they come here, to intervene and collaborate with Earth's inhabitants in suppressing poverty." With his argument, Posadas defines communism as a civilizational progress rather than an alternative political system. Although this is a single work of Posadas on extraterrestrial life, this idea has gained much popularity among his followers and later
Trotskyists. Posadas remarks that aliens "have no aggressive impulse, they have no need to kill in order to live: they come only to observe. We can foresee the existence of such beings, even taking into account the fantasies that exist among the reports, stories, observations, and statements". ==
Long live Posadas!==