California Code, Government Code - GOV § 3529

(a) Except for supervisory employees as defined in subdivision (g) of Section 3513, excluded employees shall not hold any office in an employee organization which also represents nonexcluded employees.

(b) Excluded employees shall not participate in the handling of grievances on behalf of nonexcluded employees. Nonexcluded employees shall not participate in the handling of grievances on behalf of excluded employees.

(c) Excluded employees shall not participate in meet and confer sessions on behalf of nonexcluded employees. Nonexcluded employees shall not participate in meet and confer sessions on behalf of supervisory employees.

(d) The prohibition in subdivisions (b) and (c) shall not apply to the paid staff of an excluded or supervisory employee organization.

(e) Excluded employees shall not vote on questions of ratification or rejection of memoranda of understanding reached on behalf of nonexcluded employees.