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MassCOP Welcomes Tyngsborough 911 Dispatchers Local 517 MassCOP Welcomes Lynnfield 911 Dispatchers Local 519 Members Get Your MassCOP Digital ID Wallet Card Today. Continue receiving worldclass legal defense coverage and stay uptodate with our latest updates. The Massachusetts Coalition of Police Founded in 1979 the Massachusetts Coalition of Police has the distinction as the Commonwealths premier union for law enforcement professionals. Our mission is to organize assist and advocate for the welfare of our police officers.