It is later revealed that X used the Brig to imprison Professor X, who knew X true nature, he then convinced the other mutants that telepathic powers can't exist and if so they would be very dangerous to them.
It is later revealed that X used the Brig to imprison Professor X, he then convinced the other mutants that telepathic powers can't exist and if so they would be very dangerous to them. Professor X knew X true nature.