California Code, Corporations Code - CORP § 12420

(a) Except as provided in subdivision (b), a corporation may issue memberships having different rights, privileges, preferences, restrictions, or conditions, as provided in its articles or bylaws.  If the articles or bylaws authorize at least one class of voting memberships, a corporation may also authorize and issue additional classes of memberships, preferred or otherwise, that are divisible into a series or are nonvoting or both.

(b) All worker-members shall have the rights, privileges, preferences, restrictions, or conditions as provided in the articles or bylaws.  This membership shall not be divided into partial memberships.

(c) A worker cooperative shall only make patronage distributions to the worker-member class.