(a) When in the opinion of any member, the business before the House requires that the discussion thereof be carried on in secret, such member may move that the House proceed in executive session, and when such motion shall have been adopted by the affirmative vote of a majority of all members elected, the Speaker shall direct all persons in the House chamber, except members, the chief clerk, and the sergeant-at-arms, to withdraw and the doors of the House chamber to be closed and to remain closed until such executive session shall have been completed; and every member and officer shall keep secret all such proceedings, matters, and things whereof secrecy shall be enjoined by order of the House, and for divulging the same before the order of secrecy shall be revoked by the House, they shall be subject to expulsion or dismissal, as the case may be.