California Code, Government Code - GOV § 3553

(a) This section shall apply only when an employee organization has been recognized or certified by the governing body of the public employer or the Public Employment Relations Board as the exclusive representative of employees in a bargaining unit.

(b) If a public employer chooses to disseminate mass communications to public employees or applicants to be public employees concerning public employees' rights to join or support an employee organization, or to refrain from joining or supporting an employee organization, it shall meet and confer with the exclusive representative concerning the content of the mass communication.

(c) If the public employer and the exclusive representative do not come to agreement on the content of a public employer's mass communication covered by this section, and if the public employer still chooses to disseminate the mass communication, the public employer shall distribute to the public employees, in addition to, and at the same time as, its own mass communication, a communication of reasonable length provided to the public employer by the exclusive representative. The exclusive representative shall provide the public employer with adequate copies of its own mass communication prior to distribution.

(d) This section shall not apply to a public employer's distribution of a communication concerning public employee rights that has been adopted for purposes of this section by the Public Employment Relations Board or the Department of Human Resources.

(e) For purposes of this section, a “mass communication,” means a written document, or script for an oral or recorded presentation or message, that is intended for delivery to multiple public employees.