Fourth International Posadist

[5] The Posadists began quarrelling with the majority of the ISFI in 1959 over the question of nuclear war with Posadas being a proponent as, he claimed, it would destroy capitalism and clear the way for socialism.

That was taken as a justification by the government for imposing a ban on them, Castro denouncing their influence as "pestilential" at the Tricontinental Conference held in January 1966.

[11] Posadas' death in 1981 meant the virtual dissolution of the organization, with only a few isolated groups continuing to operate to the present day.

Several satirical and non-satirical "neo-Posadist" groups emerged on social media, making Posadas "one of the most recognizable names in the history of Trotskyism".

[9][15] Posadas vocally opposed the Partial Test Ban Treaty signed in 1963 by the United States, the USSR, and the United Kingdom, believing that a nuclear war between the US and the USSR was inevitable and desirable, and would create the conditions for socialism, with the "workers' states" winning and resetting society.

[18][19] Posadas was the author of a number of works with an unconventional slant and towards the end of his life he tried to create a synthesis of Trotskyism and Ufology.

His most prominent thesis from this perspective was the 1968 pamphlet Flying saucers, the process of matter and energy, science, the revolutionary and working-class struggle and the socialist future of mankind which exposed many of the ideas associated today with Posadism.

[3] Believing visiting aliens to be naturally non-violent and only here to observe, Posadas argues that humans must call on them to intervene in solving the Earth's problems, namely "to suppress poverty, hunger, unemployment and war, to give everyone the means to live in dignity and to lay the bases for human fraternity".

After his death in 1981, some Posadists continued to explore the subject, notably Dante Minazzoli,[21] Paul Schulz, and Werner Grundmann.

[14][22] Others, however, have distanced themselves from the more unconventional notions and have claimed that Posadas' interest in extraterrestrial life was a marginal point that was blown out of proportions.