As part of the Bush Administration 's War on Terrorism , the April 3 , 2006 , Federal Register included proposed rules by the Federal Bureau of Prisons ( FBOP ) that " Limited Communication for Terrorist Inmates " . The changes were in response to criticism that the FBOP had not been adequately monitoring the communications of prisoners , permitting several terrorists convicted for the 1993 World Trade Center bombing to send letters to other terrorists overseas . " By concentrating resources in this fashion , it will greatly enhance the agency 's capabilities for language translation , content analysis and intelligence sharing " , according to a government statement released with the rules
1993 World Trade Center bombing
1993 World Trade Center bombing
Communication management unit