Mo. Rev. Stat. § 386.460
If a person subpoenaed to appear before the commission or a commissioner fails to obey the command of such subpoena, without reasonable cause, or if a person in attendance upon the commission or a commissioner shall, without a reasonable cause, refuse to be sworn or to be examined, or answer a question, or to produce a book or paper when ordered to do so by the commission or a commissioner, or to subscribe or swear to his deposition after it has been correctly produced in writing, he shall be deemed guilty of a misdemeanor, and be punished by a fine of not less than one hundred dollars nor more than one thousand dollars or by imprisonment in the county jail not to exceed one year, or by both such fine and imprisonment, and may be prosecuted therefor in any court of competent jurisdiction; and in case of a continuing violation each day's continuance thereof shall be and be deemed to be a separate and distinct offense.
§ 386.460, RSMo
RSMo 1939 § 5599