Mo. Rev. Stat. § 419.070
When the lien authorized by section 419.060 is claimed upon the wages of any such guest or boarder, the person claiming the lien shall institute an action in an associate division of the circuit court of the county which action shall be in all respects governed by the provisions of section 430.160, and the associate circuit judge shall notify the party designated by the plaintiff as owing such guest or boarder, that suit has been instituted to enforce such lien, and such notice shall be served in the same manner and have the same force and effect as garnishments in attachments, and the party so served shall be required to answer, and shall receive the same fees as provided in section 525.240.
§ 419.070, RSMo
RSMo 1939 § 3590, A. 1949 H.B. 2112