California Code, Government Code - GOV § 9414

(a) Any person who does any of the following is guilty of a misdemeanor:

(b) Any employer or person acting on behalf of an employer who, directly or indirectly, harasses any person employed by that employer, when the harassment is motivated by the fact that the employee is, was, or may be a witness before a committee, is guilty of a misdemeanor.

(c) This section shall not be construed to prevent any employer from discharging an employee for cause nor shall it be construed to prevent a labor union or an agent thereof from requesting the dismissal of an employee when the request is motivated by a cause other than that specified herein.