The prison complex doesn't want you to call it that, but yes. The 13th amendment makes a specific exception for slavery if the person is imprisoned. That's why prisoners "work" for way below minimum wage in a variety of jobs that they probably didn't choose. Not to mention that the majority of prisoners are people of color...
I was curious how many people in prison are forced to work. If this source is correct, it's about 2/3. But the conditions of that work are apparently worse than I'd thought. Here's the original report (posted last year) and an article with a summary. Correction is welcome if this is inaccurate ◉‿◉
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.
I'm not at all excusing it, but don't prisoners technically get paid for their work? It's just some horrifically pathetic wage like $0.50/hr or something like that.