Fritz Springmeier wrote a book in the early 90’s detailing an exhaustive research by following the money. The CIA knows it’s true because they use it for research:

https://www.cia.gov/library/abbottabad-compound/FC/FC2F5371043C48FDD95AEDE7B8A49624_Springmeier.-.Bloodlines.of.the.Illuminati.R.pdf