Is this leagle to do?

My CONVICTED child molesting ex husband has decided he wants his supervised visits after 8 weeks of not doing anything about it. I want to know IF it would be against the law to go to his neighbors and tell them, and take proof, of what he has done, and ask that IF he ever has UNSUPERVISED visits to PLEASE call me and the police if they see anything out of the way.

Although he is not listed because of when this happened and he was released, I feel that everyone in his neighborhood have a right to know especially since he has another child that may have sleep overs in just a few short years.