The Senate Select Committee on Intelligence oversees the various intelligence agencies of the U.S. government: the CIA, the NSA, Army Intelligence, etc.
There is no one chief of U.S. intelligence.
Intelligence - espionage and counter-espionage; data gathering
The list is the list of threats to the nation.
"The list is sobering, but usually predictable" means there are not usually any surprises on the list.
- For Teachers