Inside America’s Toughest Federal Prison - The New York Timeshttps://www.nytimes.com/2015/03/29/magazine/inside-americas-toughest-federal-prison.html
1787 Pennsylvania Prison Society1829 Eastern State Penitentiary (ESP)1963 USP Marion1971-08 1971-08 Sanford prison experiment1989 Pelican Bay State Prison1995 ADX FlorenceAryan Brotherhood (AB)Solitary confinement
United States Penitentiary, Marion - Wikipediahttps://en.wikipedia.org/wiki/United_States_Penitentiary,_Marion
1963 USP Marion

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1963 USP Marion
Lockdown penitentiariesSupermax prisons in the United States