the spread of ultra-modern “super-maximum” security prisons. Originally prevalent in the United States . . . the supermax model was increasingly followed in other countries. Prisoners confined in such facilities spent an average of twenty-three hours a day in their cells, enduring extreme social isolation, enforced idleness, and extraordinarily limited recreational and educational opportunities. While prison authorities defended the use of super-maximum security facilities by asserting that they held only the most dangerous, disruptive, or escape-prone inmates, few safeguards existed to
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