How have you filed your complaints with the landlord/management? First, I would suggest sending a certified letter outlining the dates/times of the problem. Second, if it's that bad, call the police, don't call 911 just the local precinct. All of this goes on record, so if they are being evicted it helps the case, if they aren't it might start a case for them being a nuisance. Finally, this is a little mean, but if they are illegal the last thing they want to see is the police knocking on their door with questions.