Amid all the questions about possible intelligence failures at the CIA and FBI related to Sept. 11, one spy group -- the National Security Agency (NSA) -- has largely escaped the public spotlight. But a congressional joint intelligence committee, which will examine those questions in closed hearings beginning Tuesday, will give particular attention to missed opportunities at the secretive NSA -- the largest of all such agencies and the one specifically created to warn America of surprise attack at home.

James Bamford on why the NSA is to blame for 9/11. He wants to expand the NSA's human resources and give them new technical capabilities in order to avoid future "intelligence failures."