Pretty obvious that prisons exploit prisoners in unjustified ways to the benefit of private enterprises, fail to protect prisoners they are responsible for watching, etc.
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NYC spends $168,000 a year per prisoner according to the NY Times: http://mobile.nytimes.com/2013/08/24/nyregion/citys-annual-c...
Why We Let Prison Rape Go On http://mobile.nytimes.com/2015/04/18/opinion/why-we-let-pris...
Abussive Phone Rates https://www.prisonphonejustice.org
Etc.