Massachusetts General Laws Part I. Administration of the Government (Ch. 1-182) Ch. 149, § 68

Except for the delivery of messages directly connected with the business of conducting or publishing a newspaper to a newspaper office or directly between newspaper offices, no person shall employ a minor or permit him to work as messenger for a telegraph, telephone or messenger company in the distribution, transmission or delivery of goods or messages before five o'clock in the morning or after ten o'clock in the evening.