I feel your pain - no one should have to be subjected to these surroundings. Please keep calling the Police - every time an incident occurs - to document this behavior.Documentation is important should further action be necessary. Hopefully, the Boro approved the "charge back" ordinance where these problem properties may be held liable for excessive use of Police services. Also, if it is a rental property, please try to locate a Landlord - sounds as if these people are interfering in your right to peaceful enjoyment of your property - this is likely a violation of their lease. If it is a subsidized unit, you have the Housing Authority as an option - again, nuisance activity should raise concern.