The number of people under mandatory supervised release (MSR), commonly referred to as parole, in Illinois has fallen dramatically in the past two years, reaching a 30-year low in June 2021. The SAFE-T Act of 2021 may further reduce the MSR population in coming years. In light of the changing landscape of supervision in Illinois, this article reviews the state’s history of parole and mandatory supervised release, including parole/MSR population trends, key legislation, and administrative policies that have impacted correctional practices.