Michael J. Madigan, a formidable force in the state’s politics for decades, faced federal charges of racketeering, bribery and conspiracy.

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.

Madigan, 82, and McClain, faced a 23-count indictment in federal court in Chicago on charges of racketeering conspiracy, bribery, wire fraud, and attempted extortion. They were ca