Mass. Gen. Laws ch. 56 § 33
No person shall, by threatening to discharge a person from his employment, or threatening to reduce his wages, or otherwise threatening to adversely affect the terms and conditions of his employment, or promising to give him employment at higher wages, or otherwise promising to favorably affect the terms and conditions of his employment, attempt to influence a voter to give or to withhold his vote or political contribution. No person shall, because of the giving or withholding of a vote or a political contribution, discharge a person from his employment, reduce his wages or otherwise adversely affect the terms and conditions of his employment or give him employment at higher wages or otherwise favorably affect the terms and conditions of his employment.
Violation of any provision of this section shall be punished by a fine of not more than one thousand dollars or imprisonment for not more than six months or both.
Mass. Gen. Laws ch. 56, § 33