The Illinois Democrat once lauded as the longest-serving legislative leader in U.S. history has been found guilty of some charges in a mixed verdict at his federal corruption trial in Chicago.

Former Illinois House Speaker Michael Madigan was convicted of bribery conspiracy, bribery, and wire fraud charges on Wednesday, but acquitted of several others, following a four-month trial accusing him of running a yearslong criminal enterprise to enrich himself and his political allies.

Federal prosecutors have made it clear they are listening to phone calls. But have the threats of federal investigations and wiretapped conversations actually deterred criminal behavior in Illinois politics?