Are prisons in America so bad?

From what I've seen in movies, prisons in America are a terrible place. A place where one would never want to fall. Gangs are formed inside the prison, newly arrived inmates are treated very badly, inmates kill or hurt each other, guards mistreat, food is terrible and many more. Are prisons in America really like in the movies? Or is it a modern place where the food is quite ideal, the guards are well behaved, no prisoners kill or injure each other, no one is excluded?
Are prisons in America so bad?
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