Mo. Rev. Stat. § 21.030

When assembled, the president of the senate shall preside, and the meeting shall be governed by the standing rules adopted for that purpose by the concurrence of both houses; they may punish any person, other than a member, for disorderly or contemptuous behavior in their presence, by fine and imprisonment, in the manner and to the extent either house may punish for like conduct before them by the constitution of this state.