California Corporations Code Section 35200

Any subversive organization shall not send, deliver, mail, or transmit, or suffer or permit to be sent, delivered, mailed, or transmitted, to any person in this State who is not a member of the organization any anonymous letter, document, leaflet, or other written or printed matter. All letters, documents, leaflets, or other written or printed matter issued by a subversive organization which are intended to come to the attention of a person who is not a member of the organization shall bear the name of the organization and the names and residences of its officers.