A little tidbit. Scientologists who are aware of the Crowley connection to their religion steer clear of members of Crowleys' esoteric order, the OTO.
Crowley did not particularly care for Hubbard. Hubbard was more of an associate of a student of Crowley's, a scientist who worked for the Jet Propulsion Labs named Jack Parsons.
Hubbard robbed Parsons blind, stole his wife and basically royally screwed him over.
No, Crowley did not much care for Hubbard. His opinion, I believe, was that Hubbard bastardized the teachings for his own purposes in order to enslave the masses rather than to free them, which was one of Crowley's endeavors.