Crowley - secret agent

Aleister Crowley, Secret Agent
It was in New York that Crowley really began to cement his reputation as an evil guy. In what he would later claim was an act of sabotage, Crowley wrote pro-German propaganda for a New York publisher which, he explained, was intended to hurt the Germans by making them look ridiculous for having such bad propaganda written for them. In one stroke, he turned his bad prose and treasonous leanings into a victory for freedom and democracy.
There is no proof as to whether Crowley was a) sincerely trying to sabotage the Germans and b) working for British intelligence in this effort, as he claimed. Crowley counted some fairly significant British military figures among his students. "It could have happened" is about as far as you can reasonably go.

Crowley's flirtation with Aryan supremacy didn't end with WW I, however. During World War II, a member of the OTO wrote to Adolf Hitler on behalf on Crowley, suggesting that Thelema would be a dandy choice as the national religion of the Third Reich. His German disciple tried to give Hitler a copy of the Book of the Law. It has never been proved that such a thing happened. We must resort once more to "It could have happened."

Conspiracy lovers enjoy few things more than a good Crowley-Nazi story, and there are plenty of them in circulation, but little evidence any of them actually ever happened. Claims of meetings between der Furher and der Beast and of Nazi black magic rituals appear to have been greatly exaggerated.