No, this isn't a post about Scientology (though it might as well be). Movies about cults are a pretty creepy sub-genre of horror because of how close to reality they can be.
We're all familiar with the Manson Family, David Koresh and the Branch Davidians or Jim Jones and the People's Temple. It's all in the history books for eternity. If you haven't seen them, here are some movies inspired by these real events.
Check out some other cult movie suggestions on ScreenRant.