In question are the rules of solitary confinement.
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Mayor Bill de Blasio stopped a controversial solitary confinement program for inmates under age 21 in 2016.
Now some of the mayor's critics will once again speak out against him Wednesday morning at the Brooklyn detention complex.
Some of the known gang members accused in this latest attack appeared in court on Monday.
Over the weekend, prosecutors say they viciously beat up a correction officer.
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Watch the video here:
Raw video: Correction officer attacked at Rikers Island
It was apparently in retaliation for one of them previously getting written up.
Jean Souffrant suffered a broken spine.
The Correction Officer's union says this may have never happened had punitive segregation been in place, the solitary confinement system that de Blasio ended in 2016.
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It's controversial, studies show the system unfairly targeted inmates with mental health issues and can make bad behavior worse.
Mayor de Blasio says he has no plans to reinstate it, even though at Tuesday night's State of the City address he vowed not to allow correction officers to get attacked on the job.
A heckler shouted out that he had to do more, and more criticism expected at a press conference here later Wednesday morning.
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