A great tool to use. to explore taxpayer spending. Here is a kick start:
site:
https://www.openthebooks.com/
then search and get into illinois
https://www.openthebooks.com/search/?q=illinois
https://www.openthebooks.com/illinois/
then on left side narrow to City
https://www.openthebooks.com/illinois/#City
This is just a start. There are details on agencies, school districts, townships, etc…