What are the key legal sources of prisoner’s rights?

For many years the courts failed to intervene in the operations of correctional facilities and maintained a hands-off doctrine, in the mid-1900s the courts began to dismantle the hands-off doctrine.
What are the key legal sources of prisoner’s rights?
Textbook:
Corrections in the 21st century (8th ed.) by Frank Schmalleger & John Ortiz Smykla, McGraw-Hill

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