Section 70 ILCS 1905/21 - Bondholders legal actionAny trust agreement or agreements entered into with or for the benefit of the bondholders may prescribe by whom or on whose behalf action may be taken by the bondholders, and in the absence of any such provision in the trust agreement or agreements, any holder of a bond or bonds, or of any of the coupons of any bond or bonds, issued under the provisions of this Act, subject only to a contractual restriction binding upon any such bondholder or holders, may:
(a) By mandamus, injunction, or other civil action, compel the Authority, and the member or members, officers, agents or employees thereof, to perform each and every term, provision and covenant contained in any resolution, trust agreement or contract with or for the benefit of such bondholder, and to require the carrying out of any or all such covenants and agreements of the Authority and the fulfillment of all duties imposed upon said Authority by this Act.(b) By civil action, sue to enjoin any acts or things which may be unlawful, or in violation of any of the rights of said bondholder.