I take pleasure and curiosity in visiting regularly a website of Christians of the brethren-type, although having themselves distanced quite a bit from the stance of the closed type etc....someone they are at odds with
alleged, that Aleister Crowley had links to Darby, the brethren...when I started to google,I was in for quite a surprise:
http://encyclopedia.thefreedictionary.com/Aleister+Crowley
http://www.jwmt.org/v1n0/crowleybio.html
Didn't have time for more, but have a look yourself: google search...Aleister Crowley John Nelson Darby