Kan. Stat. § 2-1604
No board of trade shall exclude from, or refuse membership therein, nor deny any of the privileges thereof to any duly authorized representative of any lawfully formed and conducted co-operative association of producers, having adequate financial responsibility, which is engaged in cash grain business if such co-operative association has complied with such terms and conditions as are, or may be, imposed lawfully on other members of such board: Provided, That no rule of a board of trade or contract market shall forbid or be construed to forbid the return on any patronage basis by such co-operative association to bona fide members, of moneys collected or made in excess of the expense of conducting the business of such association.
K.S.A. 2-1604