
“When the United States gets fascism, it will call it anti-fascism.”
Originally reported by Robert Cantrell. But years later Cantrell told Arthur Schlesinger, Jr. that that was his own summary of his conversation with Long, not Long's exact words. See They Never Said It by Paul F. Boller and John H. George (1990) https://books.google.com/books?id=6zfnCwAAQBAJ&pg=PA94&dq=when+fascism+comes+to+america,+it+will+be+called+anti-fascism&hl=en&sa=X&ved=0ahUKEwjo0sSQ0_TRAhWmwVQKHQ85C9M4KBDoAQguMAQ#v=onepage&q=when%20fascism%20comes%20to%20america%2C%20it%20will%20be%20called%20anti-fascism&f=false.
Misattributed
Variant: When the United States gets fascism, it will call it 100 percent Americanism.