On a related, and very disturbing note, "Slavery by another name" (https://www.youtube.com/watch?v=UcCxsLDma2o) describes peonage, the exception to the 13th Amendment ending slavery, that allowed involuntary servitude to continue for convicts. The problem with this is that police arrested black men on trumped up, or outright false, charges; corrupt judges signed off on these arrests; prison "sold" this free labor to farmers.

Watch the video - peonage was never taught in school, and definitely should have been.