Why not enslave them? 
Feed them sparingly, maybe house this on an island. Leave exile open as an option for lesser criminals who would otherwise lock up for years upon pointless years.
Oh... I just realized the main reason this wouldn't fly. Prisons owners would lose money $_$
We can't have that now... forget I said anything.

Feed them sparingly, maybe house this on an island. Leave exile open as an option for lesser criminals who would otherwise lock up for years upon pointless years.
Oh... I just realized the main reason this wouldn't fly. Prisons owners would lose money $_$


Please give me a home where cloud buffalo roam
Where the dear and the strangers can play
Where sometimes is heard a discouraging word
But the skies are not stormy all day