It was a combination of people. Globalists in government, and independent contractors, and others, were involved, in 9/11, they used some terrorists perhaps as pawns, and some at the top knew that it was all about divide and conquer and yet others involved may not have knew as much. So, long story short, all of the above, many people were involved at different levels, in different ways.
This is indeed all we can know right now. And we know that these kinds of giant secret operations have been done successfully before; Manhattan Project, Operation Paperclip and the one where the CIA actually tried to create Manchurian candidates. Compartmentalization is the name of that game... Thanks so much for you regular visits @joeyarnoldvn :-)
Paperclip is especially interesting.