aggressive dogs at 5134 that need to be out of the neighborhood!!!

we have lived at our home in kansas city for almost 10 years. my neighbors have recently moved in and have been there for a little over a year. They have two big pit-bulls and his girlfriend has two big pit-bulls as well. I have never had a problem with any dog until these dogs moved in. Since they have lived here these dogs have gone after 2 - 3 different dogs including my own, they have gone after me, my grandmother, and they have gone after my next door neighbors little kids that are around the ages of 5 - 8, the dogs got out of the yard and went up to the elementry school and pinned a kid up against the fence, they went after a four yr. old and they have gone after a mother and her two kids, and several other people. These dogs are dangerous. I have called animal control and so has several neighbors, we have also called police several times, we have even gone to court. This is getting to be to the point where noone is going to do anything until someone gets bittin or worse attacked and killed. We ; our neighborhood needs help to get these dogs out. This is why I am petitioning to get these dogs out. Im afraid if something does not happen someone is going to get hurt. These dogs even went after a cop, and yet the dogs are still there and so is the owner. This owner is a drug dealer and drug addict, he needs to get out. Please help us!!!