Cal. Gov. Code § 1157.7

Employees of a public agency employing more than 20,000 persons, other than a city and county, may authorize dues deductions for membership in an ethnic employee organization operating within the public agency prior to January 1, 1981, which includes ethnic minority employees and which has as its primary purpose representing those employees in their employment civil rights with the employer. This purpose shall not include meeting and conferring with the public agency concerning matters within the scope of representation pursuant to Chapter 10 (commencing with Section 3500).