I've had the same problem sometimes, though I don't have entire classes of chronic troublemakers. The usual Korean method of discipline at my school is simply to scream and beat the students if they misbehave, even slightly (which is completely ineffective, as well as only being an excuse to take one's anger out on the kids). While I can't change it at the school, I have been able to get it stopped for the most part in my classes by talking with my co-teacher. What age are your students? What does your co-teacher do in this class as opposed to the others?
Making teams can be good, but even that can be hard to get done sometimes, and the classes can get very loud quickly. What kinds of lessons are you doing with this special class? It might not just be the students themselves, but if they were more interested in the lesson they'd be more inclined to participate.