FBI vs. Communists

Turns out 9/11 was not the first time the FBI found itself institutionally incapable of meeting present threats. From Evan Thomas' biography of RFK:

In New York, Kennedy asked for the FBI's files on organized crime and got mostly newspaper clips. The New York office had four hundred agents out looking for communists and ten devoted to the mob. Kennedy was scornful. By 1961, the American Communist Party had only a few hundred members, Kennedy knew, and most of them were undercover FBI agents.

And they say the military is always fighting the last war.