First, the tenant should keep a list of each and every incident of harassment. The list should include the date, time and place of the incident as well as the names, addresses and phone numbers of any witnesses. Second, the tenant should write a letter to the landlord demanding that the harassment stop. If this does not work, the tenant may be able to sue the landlord in small claims court or get a restraining order from the Superior Court. The tenant should seek legal advice in this type of situation.