We haven't had that since James R. Thompson was U.S. Attorney for the Northern District of Illinois when he launched Operation Greylord to investigate judicial corruption in the Cook County Court system.
The FBI got 17 convictions in that operation. ;)
> Operation Greylord was an FBI investigation of judicial corruption in Cook County, Illinois, in the 1980s. Ninety-two people were indicted, including 17 judges, 48 lawyers, 8 policemen, 10 deputy sheriffs, 8 court officials, and 1 state legislator. Operation Greylord was named after the curly wigs worn by British judges. ...