Federal prisons are mostly for "white collar" criminals. He will not be in as much danger as he would if he was in Attica (New York State Prison), Jackson (Michigan) or Huntsville (Texas).
Ramzi Yousef, convicted of the first World Trade center bombing, is now at the Supermax in Colo. where Moussaoui is going. When Yousef was at Attica, he used his telephone privileges to attempt to train others in bombmaking and plan future attacks. Check out Peter Lance's books 1000 Years for Revenge and Cover-up. Moussaoui should never be allowed any communication whatsoever again, and God forbid we provide him with televised Muslim "services".