In the Age of Jackson, private enterprise set up shop in the American penal system. Working hand in glove with state government, contractors in both the North and the South would go on to put more than half a million imprisoned men, women, and youth to hard, sweated toil for private gain by 1900. Held captive, stripped of their rights, and subject to lash and paddle, convict laborers churned out vast quantities of goods and revenue, in some years...