Cal. LAB § 1133

“Professional strikebreaker” means any person other than supervisorial personnel who have been in the employ of the employer before the commencement of the strike or lockout or members of the immediate family of the owner of the place of business:

(1) Who during a period of five years immediately preceding the acts described in subdivision (2) of this section has offered himself and has been accepted on repeated occasions to two or more employers at whose places of business a strike or lockout was currently in progress, for employment for the duration of such strike or lockout for the purpose of replacing an employee or employees involved in such strike or lockout, and

(2) Who currently offers himself to an employer at whose place of business a strike or lockout is presently in progress for employment for the purpose of replacing an employee or employees involved in such strike or lockout.

As used in this section:

(a) “Repeated occasions” means on three or more occasions (exclusive of any current offer for employment in connection with a current strike or lockout).

(b) “Employment for the duration of such strike or lockout” includes employment for all or part of the duration of such strike or lockout; and, in connection therewith, includes services during all or part of such strike or lockout which began no more than one month prior to the initiation thereof, or, in the alternative, which concluded not later than one month after the termination of such strike or lockout.

(c) “Employment” means services for an employer, whether compensated by wages, salary, or any other consideration not limited to the foregoing and whether secured, arranged or paid for by an employer or any other person, partnership, firm, corporation, association or other entity.

(d) “Supervisorial personnel” means those employees who have the authority to hire, fire, reward, or discipline other employees of the employer, or who have a history of having had the authority to effectively recommend such action.