https://daily.jstor.org/slavery-and-the-modern-day-prison-pl...
https://www.pbs.org/newshour/nation/inmates-at-louisianas-an...
I am sure American slaves were better treated than Soviet goulag prisoners. After all, slave owners didn't want to "break" too much their property.
Default uneducated behavior to respond to anything USSR related with "BUT STALIN GULAGS" (when gulags are both from the time of Lenin and heavily ran by Trotskyists, who, if you've heard anything about them, weren't exactly Stalin's best friends.). Bringing in nazis is just the cherry on top.
Shit knowledge and reading of history doesn't make an argument.
I get that there are problems today too, and in the US too, but honestly they don't compare. If that's a problem for your politics then, frankly, maybe your politics are just wrong.