Mo. Rev. Stat. § 532.650

Any person having in his custody, or under his power, any person for whose relief a writ of habeas corpus shall have been issued, or who would be entitled to a writ of habeas corpus to inquire into the cause of his detention, who shall, with intent to elude the service of such writ, or to avoid the effect thereof, transfer such prisoner to the custody or place him under the control or power of another, or conceal him, or change the place of his confinement, shall be deemed guilty of a misdemeanor, and shall also pay to the party aggrieved five hundred dollars.