Except as otherwise provided by the Legislature, employees shall have the right to form, join, and participate in the activities of employee organizations of their own choosing for the purpose of representation on all matters within the scope of representation. Employees also shall have the right to refuse to join or participate in the activities of employee organizations.
Source:
Section 110002, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=GOV§ionNum=110002..