Article VII, § 9

Notwithstanding any other provision of this Constitution, no person or organization which advocates the overthrow of the Government of the United States or the State by force or violence or other unlawful means or who advocates the support of a foreign government against the United States in the event of hostilities shall: (a) Hold any office or employment under this State, including but not limited to the University of California, or with any county, city or county, city, district, political subdivision, authority, board, bureau, commission or other public agency of this State; or (b) Receive any exemption from any tax imposed by this State or any county, city or county, city, district, political subdivision, authority, board, bureau, commission or other public agency of this State. The Legislature shall enact such laws as may be necessary to enforce the provisions of this section.