Details:
A corporation created in 1934 and owned by the federal government, oversees penal labor, and sets the condition and wage standards for working inmates. UNICOR’s official line is that in exchange for their slave labor, prisoners are given “vocational training.” Yet the workplace conditions are often appalling, and the transfer of skills to the private sector is dubious.
Source:
http://occasionalplanet.org/2015/12/01/u-s-companies-make-a-killing-off-prison-slave-labor/