I was surprised today to read the Thirteenth Amendment which allows slavery for prisoners. From what I have heard Trump's proposed criminal justice reform bill does not tackle this issue and both government and private corporations in some states pay slave wages of pennies per dollar to prisoners.
Massachusetts does pay regular wages to inmates on work release. Funds go first to child support to minimize the state having to pick up the tab in welfare payments to raise their kids, then most of the balance goes into an account the prisoner gets upon release to get back on his or her feet. There may be deductions for transportation to or from the job site, something like $10 per day. One man got out with enough to buy himself a vehicle so he could get to and from work. This is the way I think prison labor should work.