Massachusetts General Laws Part I. Administration of the Government (Ch. 1-182) Ch. 151A, § 26

No waiting period shall be served and no benefits shall be paid under this chapter to an individual for any week with respect to which, or a part of which, he has received or is seeking unemployment benefits under an unemployment compensation law or employment security law of any other state or of the United States; provided, that, if the appropriate agency of such other state or of the United States finally determines that he is not entitled to such unemployment benefits, this section shall not apply.