Mo. Rev. Stat. § 80.080: Trustees — powers and duties as to members and meetings.

The board of trustees shall judge of the qualifications, elections and returns of their own members; they may determine rules of their own proceedings, punish any member or other person for disorderly behavior in their presence, and, with the concurrence of four of the trustees, expel any member, but not a second time for the same cause; they shall keep a journal of their proceedings, and, at the desire of any member, shall cause the yeas and nays to be taken and entered on the journal, on any question, resolution or ordinance; and their proceedings shall be public.