Paul Robeson was another one.
You could write a long multi-volume book set about all the useful idiots. My first direct experience with useful idiots was when I was a platoon sergeant baby sitting a bunch of ‘conscientious objectors’ after desert shield/storm.
http://mltranslations.org/Miscellaneous/DuBoisJVS.htm
By W.E.B. DuBois
“Joseph Stalin was a great man; few other men of the 20th century approach his stature. He was simple, calm and courageous. He seldom lost his poise; pondered his problems slowly, made his decisions clearly and firmly; never yielded to ostentation nor coyly refrained from holding his rightful place with dignity. He was the son of a serf but stood calmly before the great without hesitation or nerves. But also - and this was the highest proof of his greatness - he knew the common man, felt his problems, followed his fate...”
#23. Re Paul Robeson. Besides being identified as a covert member of the Communist Party USA (CPUSA) by several ex-Party members including high ranking Manning Johnson, he was eventually outted after his death as a Party member in CP newspapers and “The Young Communist League” paper “Dynamics”.
Robeson, along with another CPUSA member/Australian Communist and KGB asset (Haynes & Klehr writings), Harry Bridges, were the people who asked Frank Marshall Davis to go from Chicago to Hawaii to write communist propaganda for their front newspaper the “Honolulu Record”.
See: “Labor History”, Summer 1994, Volume 35, Number 3, “Communists and the CIO: From the Soviet Archives”, Harvey Klehr and John E. Haynes.
See Paul Kengor’s book, “The Communist: Frank Marshall Davis: The Untold Story of Barack Obama’s Mentor” , Threshold Editions/Mercury Ink, 2012.
Ain’t documentation great, esp. from the Soviet Archives?
You can show it to your stupid liberal friends who don’t believe it, and then slap them over the head a couple hundred times to drive home the point.