Last Podcast on the Left is a great series on cults and serial killers, they cover some of the best stories in history:

https://www.lastpodcastontheleft.com/

Here's one on the Order of Solar Temple (3 parts)

https://podcasts.apple.com/us/podcast/episode-341-order-sola...

(skip their alien and conspiracy stuff which they mostly do jokingly or any of their "side story" stuff which is always filler)

[1] is a 20-part article about the rise and fall of Rajneeshpuram, a city built in Oregon (why is it always Oregon?) in the 80’s to house the followers of an Indian guru-slash-cult-leader. If you’ve never heard of Rajneespuram, definitely check this out (there are other resources if you don’t have time for the long article, I think 99PI did an episode on it): the story meanders into gold Rolls-Royces, international drug and arms smuggling, and bioweapon terrorist attacks.

[1]: https://longform.org/archive/tags/rajneesh

Oh this is perfect! I was worried that it was a podcast or a documentary.

There is a documentary on Netflix about it called Wild Wild Country that's almost entirely primary-source video (they recorded everything) and modern-day interviews with former members and government officials. It's fascinating.

The Casefile podcast has an excellent series of scripted podcasts about Jim Jones and the Jonestown massacre.

https://casefilepodcast.com/case-60-jonestown-part-1/

https://casefilepodcast.com/case-60-jonestown-part-2/

https://casefilepodcast.com/case-60-jonestown-part-3/