Mass. Gen. Laws ch. 154 § 8
None of the foregoing sections of this chapter, nor section one hundred and forty-eight of chapter one hundred and forty-nine, shall be applicable to or control or prohibit the deduction of labor or trade union or craft dues or obligations, or making deposits in, purchasing shares of, or for the repayment of any loan from any credit union established under the laws of the commonwealth or of the United States, or deposits in any savings bank, trust company, national banking association or co-operative bank, or subscriptions to a non-profit hospital service corporation established under chapter one hundred and seventy-six A, or to a medical service corporation established under chapter one hundred and seventy-six B, or to a charitable corporation, or payments or contributions of or toward the cost of or the premiums on any insurance policy or annuity contract or purchase of government bonds, or purchase of stock pursuant to an employee stock purchase plan, from wages of an employee by an employer in accordance with a written request made by the individual employee; provided, that no such written request, whether recorded or not, except in the case of labor or trade union or craft dues, shall be regarded as an assignment valid against a trustee process.
Whoever fails to send the labor, trade union or craft dues deducted from an employee's wages to the union within fourteen days of the date when the dues have been deducted or are due under the collective bargaining contract, whichever comes later, shall be punished by a fine of not more than one hundred dollars. The employee whose dues have been so deducted or an officer of the union to which the dues have been assigned shall have the right to swear out a complaint for any such violation. No such penalty shall be imposed if the employer has filed a petition in a court of civil jurisdiction for the purpose of determining to whom said union dues are payable. Any other money deducted from an employee's wages shall be paid over forthwith, but in no event more than seven business days from the date when the deduction has been made or was due to the employee, to the person, credit union, bank, insurance company or corporation named by the employee pursuant to the provisions of this section, unless there is a prior written agreement between the employer and the recipient named by the employee that provides that payment may be made at some other time or times.
Mass. Gen. Laws ch. 154, § 8