apparently he was balls deep into the occult, he did a bunch of weird rituals with L Ron Hubbard with the direction of Aleister Crowley called Babalon Working
they tired to summon a woman (divine feminine called Babalon) to partake in sex magik to conceive some bastard demon child. they met a woman who fit the bill and performed some rituals but failed ultimately
L Ron ended up running away with Jacks wife and stealing a bunch money off him. (needed some funds to start scientology i guess)
Then a couple years later Jack blew himself up in some weird lab accident.
Yeah, there's a good biography of him out there. He was a guy who liked blowing things up, and that turned to rocket making and that led to military interest and Caltech's JPL. But Jack's dark side was fascination with Satanism, and he buddied with L Ron Hubbard who screwed him over. However they all partied and orgied together. I went to school with his type and worked with his type. Some smart people have poor morals and not solid mental stability. Bad to have in engineering but really bad when that type goes into politics.