105 ILCS 25/1
No membership or other dues or fees shall be paid by the governing body of any public elementary or public secondary school in this State to any association or other entity which has as one of its purposes promoting, sponsoring, regulating or in any manner providing for interscholastic athletics or any form of athletic competition among schools and students within this State if such association or other entity adopts or maintains in effect any bylaw, rule, regulation or policy which designates or requires a member to designate its school principal or any other school administrator as the representative of the member who alone is entitled to cast the vote of the member on any matter coming before such association or entity which is to be determined by a vote of its general membership; provided, that the provisions of this Section shall not apply if the bylaws, rules, regulations or policies of such association or entity, as adopted and applied: (i) authorize the governing board of each secondary school which is a member of the association or entity to appoint, as the allotted representative of such secondary school entitled to cast its vote on any matter coming before the association or entity which is to be determined by a vote of its general membership, any coach, athletic director, teacher, principal or other school administrator employed at the secondary school which the governing body chooses to appoint as such representative, and (ii) provide that if no representative of a member is so appointed by its governing body, that the school principal of the member shall be its representative authorized to cast its vote unless and until the governing body shall otherwise appoint.
105 ILCS 25/1