The commissioner may suspend or revoke any license issued pursuant to this chapter if said commissioner finds that:
Except as provided in section seven, no license shall be revoked or suspended except after notice and a hearing thereon pursuant to chapter thirty A.
A licensee may surrender a license by delivering to the commissioner written notice that it thereby surrenders such license, but such surrender shall not affect the civil or criminal liability of the licensee for acts committed before such surrender.
No revocation, suspension or surrender of any license shall impair or affect the obligation of any pre-existing lawful contract between the licensee and any person.
Mass. Gen. Laws ch. 255E, § 6