Section 185C. The commissioner, after notice to the licensee and reasonable opportunity for him to be heard, may revoke his license or may suspend the same for such period as the commissioner may deem proper, upon satisfactory proof that the licensee has violated or permitted a violation of any condition of his license or of any rule or regulation of the commissioner under section one hundred and eighty-five E. If the license is revoked, the licensee shall be disqualified to receive a license for one year after the expiration of the term of the license so revoke.