Cronkite showed the media exactly what they could do. Damn the man!
Yes. Crohkite was one of the top people in the Mediacracy.
But it does not have a formal heirarchy or command structure. It is a committed ideology, committed to its conception of the structure of the Universe, and committed to change the society into what it wants, instead of what it is.
The Mediacracy is a distributed power structure.