Legal Question in Landlord & Tenant Law in New Jersey

Unless the LL has control over the alleged racist parties, I do not think you have any recourse against the LL. You may be able to make an colorable and interesting equitable arguement, of "impracticability", as you could not/did not anticipate that the apt. would not be suitable for the purposes intended, and that you are being denied the right of quiet enjoyment of your leasehold, because of circumstances, which would entitle you to get out fo the lease, and find a suitable rental. This wold all be VERY fact sensitive!!!