Inspectors general are present at multiple levels of government in Illinois, including state, county, and local bodies. They serve as independent watchdogs that investigate the wrongdoings of agencies. They are tasked with direct oversight to stop corruption and hold each agency accountable through leading investigations that evaluate claims or instances of wrongdoing in the agency.
Check out this Better Government Association Guide that details the goals and and jurisdiction of each inspector general office and identifies the appropriate office to submit various claims of governmental wrongdoing.