Intelligence officials, angry that former Attorney General Alberto Gonzales had blocked an FBI investigation into Democratic Rep. Jane Harman's interactions with a suspected Israeli agent, tipped off Nancy Pelosi, the House Democratic leader, that Harman had been picked up on a court-ordered National Security Agency wiretap targeting the agent.

In doing so, the officials flouted an order by Gonzales not to inform Pelosi, three former national security officials said.

Only two-plus years ago some members of the House Intelligence Committee and top FBI counterterrorism officials didn't know that there were important differences between the Sunnis and Shi'a battling for control of Iraq, or what side al Qaeda is on. 

Now it might behoove them to learn that the objectives and tactics of Sunni and Shi'a terrorists also differ widely, according to a fascinating new study from the Combating Terror Center at West Point, N.Y.