Any Country that mandates that Prisoners work for little or no pay while incarcerated is supporting institutionalized Slavery.
I’m putting the ACLU argument forward as the Pro position as it is very well written and touches on all the points that I would simply be restating.
Have fun!
Prison labour should be limited to apprenticeships in order to teach prisoners new skills to reinsert into society. And under no case forced under the threat of i.e solitary confinment.
The way it works in the US is the best way to release people that will instantly get into crime again due to leaving prison with nothing and having no possibility to gain money legally + a potential gigantic debt on the back of their family
Prison should be a place where criminals learn to live normally in society and go back on the right path, find a job, etc, not an institutionalized racket scheme that produces even more desperate and impoverished people who will not change anything about their way of life and keep doing nasty business with the help of all the new acquaintances they made there.