Mass. Gen. Laws ch. 78 § 7
A town may establish and maintain public libraries for its inhabitants under regulations prescribed by the city council or by the town, and may receive, hold and manage any gift, bequest or devise therefor. The city council of a city or the selectmen of a town may place in such library the books, reports and laws which may be received from the commonwealth. That part of the records of a public library which reveals the identity and intellectual pursuits of a person using such library shall not be a public record as defined by clause Twenty-sixth of section seven of chapter four. Library authorities may disclose or exchange information relating to library users for the purposes of inter-library cooperation and coordination, including but not limited to, the purposes of facilitating the sharing of resources among library jurisdictions as authorized by clause (1) of section nineteen E or enforcing the provisions of sections ninety-nine and one hundred of chapter two hundred and sixty-six.
Mass. Gen. Laws ch. 78, § 7