Mo. Rev. Stat. § 416.635: Civil action by injured party authorized.

Any person who is injured in his business or property in a relevant geographic market by reason of anything forbidden or declared unlawful by sections 416.600 to 416.640 may sue therefor in any circuit court of this state in which the defendant or defendants, or any of them, reside, or have any officer, agent or representative, or in which any such defendant, or any agent, officer or representative may be found. Such action shall be brought within four years of the alleged occurrence. Such person may:

(1) Sue for damages sustained by such person, and if the judgment is for the plaintiff, such person shall be awarded threefold damages by him sustained and reasonable attorney's fees as determined by the court, together with the costs of suit; and

(2) Bring proceedings to enjoin the unlawful practices, and if decree is for the plaintiff, such person shall be awarded reasonable attorney's fees as determined by the court, together with the costs of the suit.