This is nuts
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Scientology didn't take off until about 1953, when LRH published "Dianetics" in 1949.
Harlan Ellison has told a story of seeing Hubbard at a gathering of the Hydra Club in 1953 or 1954. Hubbard was complaining of not being able to make a living on what he was being paid as a science fiction writer. Ellison says that Lester del Rey told Hubbard that what he needed to do to get rich was start a religion.
He wrote a lot of crap until "Dianetics," mostly pulp fiction stuff including Westerns, Sci-fi and adventures.
"Battlefield Earth," all 1000+ pages of it, is what he's best known for. Published in 1982.
https://www.wiseoldgoat.com/papers-scientology/hubbard_fiction_of_lrh_chrono-list.html
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On the recommendation of a friend, who in retrospect was a total freaking weirdo, I attempted to read the Mission Earth series by Hubbard.
It was pretty crap.
A bunch of us were also once grabbed by the Scientologists, aged about 16, and put through their questionnaire - they have a "church" in Manchester from which they'd ambush young people and offer to give them a 'personality test'. Clearly, we all failed, as they subsequently showed absolutely no interest in me or any of my friends.