To deal with bullying, go to the source with your child and you confront them kids. Tell them that this is your child so he who fawks with kid will also fawk with you. Use profanity to make a statement cuz kids, especially the little bully ones hearing it from adults will scar them for the rest of their life.
If that doesn't work, enroll your child into your friend child or their cousins schoolings where they are a few grades older. They can watch your kids for you and if they know your child has backup, no one gonna fawk with your kids.
They just bring their bullying dad over to kick your azz.
I think Milwaukee doesn't really allow kids to change school in the middle of the school year unless they're going to a worst school than the one they're in already.