He joined the FBI in 1979 and In 2001, Robert Hanssen was sentenced to 15 consecutive life sentences in federal prison (without parole; there’s no parole in the federal prison system). He’s currently “living” the rest of his days in at ADD Florence, a supermax prison near Florence, Colorado. ADX Florence is basically Arkham Asylum. Built for supervillains.
If he’s a mole he should be able to just tunnel his way out of jail