put them to do slave labor for big corporations (and other employers) so that they can sell cheap goods in the U.S., some while claiming that such things are made in the USA. Also, you can't forget the prison industrial complex's role as well.
http://www.guardian.co.uk/commentisfree/2012/jul/06/prison-labor-pads-corporate-profits-taxpayers-expense
"The worst abuses of the PIE program occur in the agricultural sector, particularly in states where draconian immigration laws have led to labor shortages that have left crops rotting in fields. Rather than have to pay real-world wages, farmers turned to lawmakers to help, who, in turn, were only too happy to offer up their prisoners as a cheap alternative. In Arizona, for instance, a state law requires that all able-bodied inmates must work. Prisoners who do jobs within the institution can expect to be paid between 10 cents and 50 cents an hour, but those lucky enough to get a job working for one of Arizona's Department of Corrections (ADC)'s private partners can expect to be paid a whopping fee of "more than 50 cents an hour"."
and
In a recent expose by Truthout, a female prisoner at Arizona's state prison Perryville unit described her day working as a laborer for a private company called Martori Farms.
"They wake us up between 2.30 and 3am and kick us out of our housing unit by 3.30am. We get fed at 4am. Our work supervisors show up between 5am and 8am. Then it's an hour to a one-and-a-half-hour drive to the job site. Then we work eight hours, regardless of conditions
We work in the fields hoeing weeds and thinning plants
"Currently, we are forced to work in the blazing sun for eight hours. We run out of water several times a day. We ran out of sunscreen several times a week. They don't check medical backgrounds or ages before they pull women for these jobs. Many of us cannot do it! If we stop working and sit on the bus or even just take an unauthorized break, we get a major ticket which takes away our 'good time'."