This is a very interesting interview with a New Zealand educator in a secondary school who is talking about a way in which he deals with bullies in the classroom. Basically, he gets a team together which involves two of the worst bullies, and two of the more popular kids who hadn't been doing anything about the problem before that point. Those four people are an "undercover" team which is instituted to resolve the problem of bullying in the classroom.
He's had a 100% success rate with 27 teams which he has set up like this, over the years.
The reason this is something that's on the news in New Zealand, is because New Zealanders don't have this belief that is prevalent in the Usa where it's thought that there are a group of bad and irredeemable people out there, who are genetically predisposed to bad behavior.
New Zealand has a much tamer frame of reference which says that people may have bad character, but that character can change over time.