Includes Successor Language, Layoff Protections. Massachusetts Nurses Association, July 19, 2011 Beverly & Gloucester - Just days before the hospital system announced its pending affiliation with Burlington-based Lahey Clinic, the RNs at Northeast Health Corporation - who are unionized with the Massachusetts Nurses Association - reached a tentative agreement with management. The two-year agreement, which was finalized on July13, put an end to more than eight months worth of negotiations and several hot-button issues that had led the nurses to picket this past June. ... Unionized