This is a violation of the terms of service for Facebook. You should report it to them right away. I believe they will act in that this is the type of abuse they want to stop.
Whether police will help is not something I can speculate about. If there is the potential for criminal action, they might get involved.
Report this to Facebook right away.
Start your own Facebook page and tell everyone what is happening.
Actual legal advice can only be provided in an office consultation by an attorney licensed in your jurisdiction, with experience in the area of law in which your concern lies.