Cults. We have all heard of them, what they are and what they are capable of, and you'll be terrified to learn that we have and had plenty right in our own backyard, including Rajneeshpuram, Heaven's Gate and more.
Sources:
https://www.masterclass.com/articles/what-is-a-cult
http://legalhistorysources.com/ChurchHistory220/LectureOne/MagnaMater.htm
https://en.wikipedia.org/wiki/Ma_Anand_Sheela#Early_life_and_education
https://offbeatoregon.com/23-08d.rajneeshpuramPart4of5.html
https://en.wikipedia.org/wiki/Rajneesh
https://www.oregonlive.com/history/2017/12/how_oregon_shaped_heavens_gate.html
https://offbeatoregon.com/1606a.heavens-gate-ufo-cult-394.html
https://www.opb.org/article/2024/05/07/twinray-ashland-oregon-the-haven-cult/
https://en.wikipedia.org/wiki/Amy_Carlson_(religious_leader)#Early_life