Why are most nations opposed to prison labor? From a justice perspective, it seems that would far better repay the damage caused by whatever crimes they committed than sitting around in a prison all day. From a rehabilitation perspective, it would seem that having prisoners (who are often from poor backgrounds) learn or practice a trade of some kind, or engage in unskilled labor, might help facilitate reintegration after release. Yet I've met lots of people who equate prison labor with slavery.