Cal. Business and Professions Code § 25008

(a) Any trade association having as members licensed beer manufacturers or licensed beer wholesalers representing more than half of the volume of beer sold in California for three months prior to the date of a filing of any suit authorized in this chapter may maintain an action to enjoin a continuance of any act or acts in violation of this chapter or any rule adopted pursuant thereto and, if injured thereby, for the recovery of damages. If in the action the court finds the defendant is violating or has violated any of the provisions of this chapter or any rule adopted pursuant thereto, the court shall enjoin the defendant from a continuance or further violation thereof. It shall not be necessary that actual damages to the plaintiff be alleged or proved in the action, and proof of a violation of this chapter or any rule adopted pursuant thereto shall be presumptive evidence of an intention to continue to violate this chapter or any such rule. (b) Any trade association having as members licensed beer manufacturers or licensed beer wholesalers representing more than half of the volume of beer sold in California for three months prior to the date of a filing of a petition to intervene shall, upon the filing of the petition, be permitted to intervene as a party in any proceeding, whether before the department, any other administrative agency, or any court, which involves, in whole or part, the validity of any portion of the Alcoholic Beverage Control Act or of any rule adopted pursuant thereto. Intervention shall be permitted, upon petition, at any time before a final determination or adjudication has been rendered in the proceeding. In the case of an adjudicatory proceeding, an intervening trade association shall have the same right to participate in discovery and trial as any other party.