The bullied
At school, groups will always be present. The popular kids, the intelligent and geeky kids, the quiet and secluded ones and the bullies. When your child gets bullied you will notice his dislike to go to school. He would not prepare to go, he would not be excited to wake up everyday, and he would often look pale and sad every time he leaves the house.
Those are signs that your child is being bullied. It will cause a lot of trauma for your kid. Moving would not help because the pain is still there. Teach him how to defend himself by talking to those who bully him. Unless he learns how to stand up for himself, people will always step on him. This is a valuable lesson that most parents have to teach their kids. Also, try to talk to his teachers and to the parents of those who are always bullying him.