Mass. Gen. Laws ch. 161B § 19
Bonds issued under this chapter are hereby made securities in which all public officers and public bodies of the commonwealth and its political subdivisions, all insurance companies, and savings banks, co-operative banks and trust companies in their banking departments, banking associations, investment companies, executors, trustees and other fiduciaries, and all other persons whatsoever who are now or may hereafter be authorized to invest in bonds or other obligations of a similar nature may properly and legally invest funds, including capital in their control or belonging to them, and such bonds are hereby made obligations which may properly and legally be made eligible for the investment of savings deposits and the income thereof in the manner provided by section fifteen B of chapter one hundred and sixty-seven. Such bonds are hereby made securities which may properly and legally be deposited with and received by any state or municipal officer or any agency or political subdivision of the commonwealth for any purpose for which the deposit of bonds or other obligations of the commonwealth now or may hereafter be authorized by law.
Mass. Gen. Laws ch. 161B, § 19