Robert Hansssen (FBI Spy)
“Hanssen is Federal Bureau of Prisons prisoner #48551-083. He is serving his sentence at the ADX Florence, a federal supermax prison near Florence, Colorado, in solitary confinement for twenty-three hours a day.[51][52]”
https://en.wikipedia.org/wiki/Robert_Hanssen
I know his family. His wife is the only one who stays in contact with him.