Their offender status doesn't matter. You can ban anyone from your repeater for any reason at any time. Do what was suggested - write them a registered letter and CC the FCC. Then, if they still use your repeater the FCC may be able to take action against them.
I can't think of any rule that would force them to relinquish their license or allow the FCC to revoke it. Joe M. Don wrote: > A group of us are aware of a Couple Registered Sex Offenders who are > Lic > Ham Radio operators, They use some of the Local Repeaters . And have > Engages in conversations with Lets say Younger Ham radio Operators, > Boy > Scouts, little league Etc > > We would like to Know is there is a FCC Ruling against Them still > Holding and using a Valid Amateur Radio Lic