IANAL: I agree that the friend should call the police and let them decide. It's a nuisance law and an attorney's services will probably be required to fix the issue.

https://www.calalaw.com/practice-areas/real-estate-law/private-nuisance/

> Massachusetts law uses the ordinary person standard to determine whether something is a private nuisance. You must prove that an ordinary person would be bothered by the alleged behavior or circumstances causing the public nuisance. For example, if you have an extremely sensitive sense of smell and a nearby odor is causing you grief, from a legal standpoint, you may not have a case if an ordinary person wouldn’t find the same odor offensive.

> In Massachusetts, a property holder must prove that a nuisance has caused “significant harm” to their interest. The nuisance has to impact their use and enjoyment of the land directly.