If prisons were to segregate inmates by race and keep them away from each other, prison violence would decrease. Inmates mostly assault other inmates of another race and rarely their own, so if these inmates were separated by race in different areas from each other, the incidence of assaults would most likely decrease. At this point you could focus on crimes within specific races and the threat of race war isn't that big of a deal. Another possible ramification with inmates of different crimes is the fact that more aggressive or more experienced offenders may manipulate and teach minor offenders to do things that they may not have known or wanted to do in the past. Some inmates feel needed and capable of learning the trade from these criminals. When they go out, they are more knowledgeable about different crimes and how to commit them when manipulated by experts.