Mo. Rev. Stat. § 408.240
Any person, firm, or corporation who or which shall violate the provisions of sections 408.100 to 408.241 and any member, officer, director, agent or employee of such person, firm or corporation who shall participate in such violation shall be guilty of a class A misdemeanor, except where such violation occurred either:
(L. 1979 S.B. 305, A.L. 1988 H.B. 1355, A.L. 1994 H.B. 1312 merged with S.B. 718)