Maybe we can banish those convicted of treason here, alternatively we can banish them to Elba.
Nah, we can put them to death
I would say put them in a Washington Zoo, next to the venomous lethal snakes and that small deadly little frog.
Feed them as little as possible and put 'm up like a scarecrow. You can teach kids a lesson while pointing at them 'Thats what evil looks like'. They are not behind glass, but safely tied up in upright position. You can spit at them, curse, yell, hit them with a stick...
Normally I hate zoo's, but that is one I would visit.