Zbigniew Brezinski, David Rockefeller, other folks in those circles. A small subset of folks at the trilateral commission, council of foreign relations, bilderberg group meetings and similar groups.
A collection of intellectuals, industrialists, bureaucrats, politicians and bankers.
I'd guess the bankers are closer to the source. Maybe some subset of some families keeping a family tradition going. I'd guess they probably select the intellectuals, industrialists, bureaucrats and politicians that will go with the program though I'd guess some of the selected folks sometimes become part of the inner circle. I don't know. 
Recently came across Alex Newman. He has "them" mapped out pretty good. Patrick Wood has some pretty good maps too.
"They", or front groups that "they" use have actually been publishing alot of what they want to do. Following the money and other connections of documents like agenda21, agenda2030, lockstep, project for a new american century etc
Guys like Alex Jones have been reading that stuff and warning folks about what "they" say want or are going to do