Cal. Elec. Code § 18650

No one shall knowingly or willfully permit the list of signatures on an initiative, referendum, or recall petition to be used for any purpose other than qualification of the initiative or referendum measure or recall question for the ballot, except as provided in Article 2 (commencing with Section 7924.100) of Chapter 2 of Part 5 of Division 10 of Title 1 of the Government Code. Violation of this section is a misdemeanor.