In March 2015 a federal judge ruled against prisoners challenging the practices of “Communication Management Units” (CMUs). Nicknamed a "Little Gunatanamo," a CMU severely restricts prisoner communication, including information access and human contact. They require no federal oversight, and no explanation for sentencing. All appeals against CMU transfers have been unsuccessful. CMU's are currently located in Indiana and Illinois.
See 2015 article at: http://www.huffingtonpost.com/2015/03/16/prisoners-little-guantanamo_n_6881774.html
In 2013 an environmental activist published an exposé on the conditions of the CMUs in the Huffington Post and was re-incarcerated for this publication. His own lawsuits against the CMUs were thrown out, because of a law that limits the rights of federal prisoners to challenge “cruel and unusual punishment.” He is continuing to pursue a lawsuit that questions the legality of his jailing after writing out against CMUs, but the loss of this larger lawsuit is a blow to the challenge of CMUs.
See 2013 article "Court Documents Prove I was Sent to Communication Management Units (CMU) for my Political Speech" http://www.huffingtonpost.com/daniel-mcgowan/communication-management-units_b_2944580.html