Mad Jim Jaspers is the biggest Uncle Tom to mutants. He was a senator who pushed legislation to remove and eliminate mutants, but get this... he was a mutant himself who could warp reality. Who sells out their own people like that? To be fair, he's completely insane, so it's not like he's doing it for any real reason. He just wanted to be the only mutant so he could do whatever he wanted.
After he succeeded in elimination mutants he went on crime sprees and had a good time, which got him the nickname Mad Jim Jaspers. It's not like he ran for senate with that name. Nick Fury ended up killing him by taking him into a void where there was no reality to warp. Bang. One bullet in the head and Mad Jim Jaspers was done.