It is unlikely that the Springfield Police will agree to get involved in this situation, which is a civil, not criminal matter. Therefore, your best course of action is to send a letter or e-mail to your landlord outlining your complaints and asking him to remedy the situation. The landlord must then send the offending tenants a Notice to Cease, demanding that they immediately stop the offensive behaviors; if they fail to do so, then the landlord must send them a Notice to Quit, giving them at least 3 days to vacate the premises before filing an eviction complaint in the Landlord-Tenant section of Superior Court in Union County . If the landlord fails to take these actions on your behalf, you may be entitled to an abatement in your rent due to the infringement upon your right to quiet enjoyment. You other option,should you so desire, would be to terminate your tenancy and vacate the premises yourself, using the landlord's failure to deal with the disturbance to your quiet enjoyment of the premises as justification for breaking the lease (if you have a written, year-long lease) early; if you are a month-to-month tenant, then you only have to give the landlord one month's notice of your intention to vacate. Be sure to document all communication with the landlord writing so you can prove why you have done whatever course of action you choose.