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!
Realistically it seems to be (not my opinion but my observation):
Just to name a few examples of slave labour required to run the world “as is.”
Any country where forced labor is a condition of incarceration fits the definition of slavery fwiw.