70 ILCS 1815/21
The holder or holders of any bonds, certificates, or interest coupons issued by the District, may bring civil actions to compel the performance and observance of the Port District or any of its officers, agents or employees, of any contract or covenant made by the Port District with the holders of such bonds, certificates or interest coupons, and to compel the Port District and any of its officers, agents, or employees to perform any duties required (by provisions in the ordinance authorizing their issuance) to be performed for the benefit of the holders of any such bonds, certificates or interest coupons, and to enjoin the Port District and any of its officers, agents or employees from taking any action in conflict with any such contract or covenant, including the establishment of charges, fees and rates for the use of facilities as hereinafter provided.
70 ILCS 1815/21