Aleister Crowley was a satanist, occultist, bisexual, and was also described as "The Wickedest Man In the World.". Crowley also had very sexist views merely finding women "tolerable" when they contributed to a man's work, but (according to Crowley) they had no hope of understanding the work (as they were less intelligent then men, according to him). It should however be noted that Crowley was very pro-life, believing abortion to be murder and he also believed that a woman would never really want to end a pregnancy.
Crowley and his followers practiced animal sacrifice which led him to be thrown out of Italy in 1924. He ate human feces. He was a drug addict who used to cut his arms with a knife. He died in poverty in 1947.
L. Ron Hubbard was a great fan and even incorporated some of Crowley's ideas into Scientology. For some unknown reason rock musicians have been fascinated by Crowley including the Beatles who put his photograph on one of their albums.