I read that L Ron Hubbard was part of Alister Crowley’s Satanist crowd back in the ‘40s until he stole Crowley’s girlfriend and $10,000.
Hubbard stole Jack Parson's wife (Sara Northrup) and money.
Sara Northrup's mother's first husband was an Englishman named Thomas Crowley; however, he was not Sara Northrup's father, and he was not related to Aleister Crowley (or at least not closely).
Sara Northrup was the sister of Jack Parson's wife.
However, Parson did have a sexual relationship with Sara Northrup before she married Hubbard; for all I know, it may have continued after that marriage.
Parson's killing himself by blowing his own face off in a rocket fuel definitely ended it.