Students:Have you ever seen ‘chain gangs’ or inmates’ working on the interstate highways? What

Students:
Have you ever seen ‘chain gangs’ or inmates’ working on the interstate highways? What allows the state/government to legally carryout this act? 
Watch the following video on ‘13th”
‘Neither slavery nor involuntary servitude, except as a punishment for crime whereof the party shall have been duly convicted, shall exist within the United States, or any place subject to their jurisdiction.’
https://www.youtube.com/watch?v=krfcq5pF8u8
Discuss the implication from the video where it allows the government to enact a form of enslavement.