Anons, there was a congressional investigation into the tax-exempt foundations in the 1950s. It was called the Reece committee. It investigated how these foundations have been bringing collectivism into the US education system and other activities of monopolistic endeavors.
Tax-exempt foundations are part of the Deep State.
There was a report issued as there is for all congressional committees. Public libraries often have all of the published reports. This report was distributed, but then the foundations went all over the country and obtained EVERY COPY BUT ONE and took them. The last and only copy is in the possession of Charlotte T. Iserbyt. Look her up - she's written extensively on the dumbing down of America.
I have found a PDF of her copy. It needs to be archived as many places as possible before the site is taken down. This is the smoking gun that a lot of us have been looking for.
The webserver is a bit erratic and cannot handle a lot of traffic all at once. I'll send out other links for downloads over the next few days. Important to archive offline.
http://deliberatedumbingdown.com/ddd/wp-content/uploads/2018/04/Tax_Exempt_Cox_All.pdf