Juan R Posadas, one of the World’s strangest political thinkers, was no ordinary Trotskyite; socialists from outer space, the benefits of nuclear war and communication with dolphins were all part of his revolutionary programme. We think of UFO cults, typically, as being naïve, fancy-dress Californian affairs, scary religious Doomsday sects, or even neo-Nazi groups convinced that flying saucers operate from a secret Antarctic base. But there was one UFO cult at the opposite end of the political spectrum: a Trotskyite UFO cult. They called themselves the Posadists after their founder Juan R Posadas and, like many UFO cults, they bore...