Once lauded as the longest-serving legislative leader in American history, Michael Madigan will enter a federal courtroom this week on charges he used his vast influence to run a “criminal enterprise” to amass even more wealth and power.

The former Illinois House speaker is charged in a multimillion-dollar racketeering and bribery scheme that included the state’s largest utility, ComEd.

From wiretapped calls to video-recorded meetings, much of the evidence has been previewed in open court. A sweeping investigation of public corruption has already produced convictions of legislators and Madigan’s former chief of staff.