American equivalent to 1946 Canadian Royal Commission's "official disclosure of Russia's Fifth Column in Canada"?

David Chambers's picture

Colleagues:  

Do any of you know of an American counterpart to the Canadian Royal Commission's "official disclosure of Russia's Fifth Column in Canada"?  

Available online here:  https://mises.org/system/tdf/AA1946_VIII_4_2.pdf?file=1&type=document  

Furthermore, do any of you know of such an American document published so early (1946), much less earlier?  

Gratefully – David