It would also tend to take away the unfair advantage illegal labor has over the rest of the country. Perhaps that means more vegetables out of the states in the North. There will be higher food prices but lower costs for educating & housing illegals. Prison labor may come back into fashion again. I know that $6/hour is great pay when you are behind bars.
I love the idea of prison labor. Good honest work, and they should be paid so that they do better than the slackers who refuse. They will also come out with a trade and patience. You want to be part of free society? Prove it.