California Codes, Code of Civil Procedure - CCP, Part 2 — Of Civil Actions, Title 7 — Other Provisional Remedies in Civil Actions, Chapter 3 — Injunction, Section 527.7

(a) It shall be unlawful for any group, association, organization, society, or other assemblage of two or more persons to meet and to advocate, and to take substantial action in furtherance of, the commission of an unlawful act of violence or force directed to and likely to produce the imminent and unlawful infliction of serious bodily injury or death of another person within this state.

(b) Whenever it reasonably appears that any group, association, society, or other assemblage of two or more persons has met and taken substantial action in furtherance of the commission of an act of violence made unlawful by subdivision (a) and will engage in those acts in the future, any aggrieved individual may bring a civil action in the superior court to enjoin the advocacy of the commission of any act of violence made unlawful by subdivision (a) at any future meeting or meetings. Upon a proper showing by clear and convincing evidence, a permanent or preliminary injunction, restraining order, or writ of mandate shall be granted.

(c) Whenever it appears that an action brought under this section was groundless and brought in bad faith for the purpose of harassment, the trial court or any appellate court may award to the defendant attorney’s fees and court costs incurred for the purpose of defending the action.