Read the trade magazines.
Also read the CFR websites like this one.
They make many admissions.
https:// www.foreignaffairs.com/articles/united-states/2013-02-11/red-white
http:// spartacus-educational.com/Harry_Dexter_White.htm#section3
Note his associates
Harry Dexter White, the seventh and youngest child of Joseph Weit and Sarah Magilewski, was born in Boston on 9th October, 1892. His parents were Jewish and came from Lithuania, who had settled in the United States in 1885.