Well,however misguided Guthrie might have been in general you must,at least,give him credit for that.
Wikipedia citation above says something similar:
“Notwithstanding Guthrie’s later claim that “the best thing that I did in 1936 was to sign up with the Communist Party,” he was never a member of the Party. He was noted as a fellow traveleran outsider who agreed with the platform of the party while not subject to party discipline.”
...but note that Guthrie’s later claim that he WAS a member. Who ya gonna believe? The man himself? Or a biographer? Maybe he was like Obama, just polishing up his street cred?