These Wikipedia Pages About Cults Will Have You Crying In The Fetal Position
The Blackburn Cult

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Originally founded by a mother-daughter duo, they both believed that they could communicate with the dead. They also believed that they could resurrect from the dead.
They had followers who whole-heartedly believed that they could speak to angels, so much so that they put hundreds of thousands of dollars into the cult. The duo was accused of killing one member by putting her in the oven and poisoning another. The cult stopped when the mother got arrested for grand theft. This bizarre secret society coming up got their inspiration from the Medieval Knights Templar.