Cal. Lab. Code § 1160.6
Whenever it is charged that any person has engaged in an unfair labor practice within the meaning of paragraph (1), (2), or (3) of subdivision (d), or of subdivision (g), of Section 1154, or of Section 1155, the preliminary investigation of such charge shall be made forthwith and given priority over all other cases except cases of like character in the office where it is filed or to which it is referred. If, after such investigation, the officer or regional attorney to whom the matter may be referred has reasonable cause to believe such charge is true and that a complaint should issue, he shall, on behalf of the board, petition the superior court in the county in which the unfair labor practice in question has occurred, is alleged to have occurred, or where the person alleged to have committed the unfair labor practice resides or transacts business, for appropriate injunctive relief pending the final adjudication of the board with respect to the matter. The officer or regional attorney shall make all reasonable efforts to advise the party against whom the restraining order is sought of his intention to seek such order at least 24 hours prior to doing so. In the event the officer or regional attorney has been unable to advise such party of his intent at least 24 hours in advance, he shall submit a declaration to the court under penalty of perjury setting forth in detail the efforts he has made. Upon the filing of any such petition, the superior court shall have jurisdiction to grant such injunctive relief or temporary restraining order as it deems just and proper. Upon the filing of any such petition, the board shall cause notice thereof to be served upon any person involved in the charge and such person, including the charging party, shall be given an opportunity to appear by counsel and present any relevant testimony. For the purposes of this section, the superior court shall be deemed to have jurisdiction of a labor organization either in the county in which such organization maintains its principal office, or in any county in which its duly authorized officers or agents are engaged in promoting or protecting the interests of employee members. The service of legal process upon such officer or agent shall constitute service upon the labor organization and make such organization a party to the suit. In situations where such relief is appropriate, the procedure specified herein shall apply to charges with respect to paragraph (4) of subdivision (d) of Section 1154.
Ca. Lab. Code § 1160.6