Slave labor convictions for blacks were very common in the South from reconstruction up until World War II when they fell out of favor. For 70 years from 1870 to 1940 it was quite routine whenever slave laborers were needed for companies to pay local sheriffs to round up blacks on bogus charges such as loitering, convict them in sham trials, and then sell them to corporations to do hard labor 6 days a week 14 hours a day. This is extensively documented in Blackmon's "Slavery by Another Name: The Re-Enslavement of Black Americans from the Civil War to World War II."