735 ILCS 5/2-417
Whenever the Illinois Educational Labor Relations Board commences an action under subsection (b) of Section 16 of the Illinois Educational Labor Relations Act seeking to enforce a final order of the Board or alleging a violation of a final order, such action shall be commenced by petition filed in the name of the people of the State of Illinois as Petitioner and any persons charged with alleged violation of such final order shall be designated Respondents. Persons charged with alleged violation of such final order may not raise as defenses in such action any matters that such persons could have raised by initiating judicial review of such final order in accordance with subsection (a) of Section 16 of the Illinois Educational Labor Relations Act and Section 3-104 of the Administrative Review Law.
735 ILCS 5/2-417