Mass. Gen. Laws ch. 279, § 9: Second sentence for non-payment of fine

Section 9. Except as provided in section one hundred and forty-six of chapter one hundred and twenty-seven, if a convict is sentenced to pay a fine in more than one case and has been committed to a jail, house of correction or other prison or other correctional institution for refusing to pay such fine, the subsequent sentence shall take effect upon the expiration of the imprisonment under the former sentence.