The Director shall appoint a representative or representatives whose functions shall be to supervise the hearing and vote. Such representative(s) shall have final authority to issue such rulings as shall be appropriate or necessary to insure a full and fair hearing and vote. Upon his own motion or upon consideration of the petition of any interested person the Director's Representative may disqualify any officer(s) or member(s) of the union from participation in the conduct of the hearing (except in the capacity of witness or counsel).