No such suit in equity shall be abated by reason of the non-joinder of persons liable as defendants unless the plaintiff, after being notified by plea or answer of the existence of such persons, unreasonably neglects to make them parties.
Mass. Gen. Laws ch. 158, § 53
Non-joinder of parties; abatement
Official source: Massachusetts Legislature. Reproduced from public-domain Massachusetts statutes; confirm against the official source for the current text. Not legal advice.