How do you deal with problem children?

What are teachers supposed to do with problem children? I have had much experience at an afterschool program where I have definitely seem the quintessential problem child. What my boss decided to do with one of the worst of them, was ask the parent of that child to discontinue enrollment at the end of the month. My boss said it was better for the group as a whole if that child was not there. I do not know if I completely agree with that but even so I do not know what to think about it. At an elementary school, a teacher can not just as a child to leave the school! After talking to a teacher about the subject, she suggested to put that child in charge of special activities. For instance, if the teacher was going out of the room, the “problem child” would be in charge of writing down names of the children who disobeyed the rules. I have also heard of the problem child being in charge of many jobs in the classroom. The particular teacher said she recalled an incident when one of the other children came up to her and asked, “Why did ****** get to have a job this week when he already had one last week and the week before that?” She had given him many jobs because he concentrated more on the jobs than making trouble in the classroom. Also I have seen teachers who when there children get in trouble in the classroom, they have to go sit in another teacher’s classroom. By doing this, it creates a lot of embarrassment for the child but also keeps him away from valuable instructional time. There has to be a better way of reaching those children who are just a little bit harder to deal with. Do you have any suggestions?