Membership.
Section 131
SEC. 131. Membership.—Membership of co-operative wholesale societies may consist of consumers and producers co-operatives together with their federations and retailers or their associations or corporations and shall include all those of the above description who join in the articles of incorporation of any co-operative wholesale society and all those of the above description admitted to membership by the board of directors of such co-operative wholesale society after registration. Affiliated co-operatives shall be known as class "A" members and retailers and their associations or corporations shall be known as class "B" members.