Section 45. The state secretary may, upon cause shown therefor, disqualify a person from acting as an executive or legislative agent. A person against whom proceedings for disqualification are brought shall be allowed a public hearing before the secretary or his designee. Such hearings shall be subject to the provisions of chapter thirty A. No person who has been so disqualified shall be employed as an executive or legislative agent until the termination of the third regular session of the general court after such disqualification.