Reports about what life is like inside the military prison for terrorism suspects at Guantanamo Bay are not uncommon. But very little is reported about two secretive units for convicted terrorists and other inmates who get 24-hour surveillance, right here in the U.S. For the first time, an NPR investigation has identified 86 of the more than 100 men who have lived in the special units that some people are calling Guantanamo North." The Communications Management Units [CMU] in Terre Haute, Ind., and Marion, Ill., are mostly filled with Muslims. About two-thirds of the inmates identified by NPR are U.S. citizens. Prison officials opened the first CMU with no public notice four years ago, something inmates say they had no right to do under the federal law known as the Administrative Procedures Act. The units' population has included men convicted in well-known post-Sept. 11 cases, as well as defendants from the 1993 World Trade Center bombing, the 1999 "millennium" plot ... and hijacking cases in 1976, 1985 and 1996. When the Terre Haute unit opened in December 2006, 15 of the first 17 inmates were Muslim. As word got out that the special units were disproportionately Muslim ... the Bureau of Prisons started moving in non-Muslims. Guards and cameras watch the CMU inmates' every move. Every word they speak is picked up by a counterterrorism team that eavesdrops from West Virginia. [Several] inmates have been suing the Federal Bureau of Prisons. They say the special units were set up outside the law and raise serious due process issues. Unlike prisoners who are convicted of serious crimes and sent to a federal supermax facility, CMU inmates have no way to review the evidence that sent them there or to challenge that evidence to get out.