IIRC, the inscription “This Machine Kills Fascists” was seen during the Spanish Civil War on aircraft provided by the Soviet Union to fly supplies to the “Republican” (read: communist) side.
The Spanish Reds were the darlings of the literary & artistic set in this country (Ernest Hemingway, Dorothy Parker, etc.) even as they were murdering their way through areas of Spain under their control. They were a natural fit for folkies like Guthrey because they “said all the right things”.
However, it was Gen. Francisco Franco who finally prevailed, leading to the ironic saying that “although he may have won all the battles, we had all the good songs”.
Plug for Franco: kept Spain out of WWII, kept it from going communist, bequeathed a restored monarchy & democratic government upon his death, and now the socialists in Madrid are digging up his remains for relocation elsewhere. The Spanish Civil War is far from over.
And Chevy Chase's career is still dead.