Eric Walker added Entombed: Isolation in the US Federal Prison System to Supermax prisons in the United States

Eric Walker added Supermax prison - Wikipedia to Supermax prisons in the United States

Eric Walker added a number of topics to Detention and imprisonment in the United States, and added Detention and imprisonment in the United States to Detention and imprisonment and United States

Eric Walker added a number of links to ADX Florence, and added ADX Florence to Separate incarceration, Florence, Colorado and Supermax prisons in the United States

Eric Walker added Supermax prisons in the United States to Supermax prison, and added Supermax prison to Detention and imprisonment

Eric Walker added 1995 ADX Florence and 1963 USP Marion and Entombed: Isolation in the US Federal Prison System and Supermax prison - Wikipedia to Supermax prisons in the United States, and added Supermax prisons in the United States to Detention and imprisonment in the United States and Supermax prison

Eric Walker added Inside America’s Toughest Federal Prison - The New York Times and United States Penitentiary, Marion - Wikipedia to USP Marion, and added USP Marion to Supermax prisons in the United States and Lockdown penitentiaries