California Code, Business and Professions Code - BPC § 16803

Any person who, directly or indirectly, is a party to any combination, conspiracy, or association, which attempts, directly or indirectly, to prevent any other person from freely selling livestock at any market in this State for such persons as see fit to engage his services, or who endeavors to compel, directly or indirectly, any person to charge not less than a fixed minimum sum for services in the sale of livestock, or who, in any way, hinders or prevents any person from lawfully selling livestock for another for such rate of commission as may be agreed upon is guilty of a misdemeanor, and subject to the penalties prescribed in this chapter.