Cal. Elec. Code § 7855

A committee may remove any elected or appointed member, who during the term of membership, affiliates with or registers as a member of another political party, publicly advocates that the voters should not vote for the nominee of the party for any office, publicly gives support to or avows a preference for a candidate of another party or candidate who is opposed to a candidate nominated by this party, or has violated the bylaws or constitution of the committee.