“He who controls the past controls the future. He who controls the present controls the past.”
“Until they became conscious they will never rebel, and until after they have rebelled they cannot become conscious.”
“The Party seeks power entirely for its own sake. We are not interested in the good of others; we are interested solely in power, pure power.”
“Power is in tearing human minds to pieces and putting them together again in new shapes of your own choosing.”
But seriously though, this "interagency" you speak of sounds a whole lot like State Propaganda Machine.
"That's not the way the world really works anymore. We're an empire now, and when we act, we create our own reality. And while you're studying that reality -- judiciously, as you will -- we'll act again, creating other new realities, which you can study too, and that's how things will sort out. We're history's actors . . . and you, all of you, will be left to just study what we do."
 "later acknowledged to have been Karl Rove" http://www.hermes-press.com/suskind.htm
Actually, the interagency is a catchall term to mean communication between different parts of the executive branch, as they otherwise report up to different Secretaries and command structures.
There are a number of different manners and ways that interagency coordination and collaboration is done and it is not specific to public messaging.