Wow. I actually agree with Tom on this one.
Processing garbage is good.
Also, they should have bands of 20 prisoners with one guard continuously cleaning the streets, planting trees, hedging bushes, renovating abandonded property, basicly anything that needs to be done, but is not getting done due to a lack of $$$.
Imagine living is a green, sparkling clean city, while goverments save money! (I think each prisoner costs about $50 000/year here in canada).