Order (Charmed)
From Multiversal Omnipedia
The Order was a demonic cult which used to be the most powerful force, until their leader was vanquished. The Order thought Wyatt was their leader reincarnated; they used their powers to reverse Wyatt's sense of morality, making him think good is evil and the other way around, so they could kidnap him and raise him to become their leader.
The Order did manage to turn Wyatt evil, but later his mother and her sisters, with the help of Chris, saved him, and turned him good once again. In the process of rescuing Wyatt, the Charmed Ones managed to kill most of the members of The Order.