If you're going to make statements like that you really should deign to study the politics of the '30s, '60s and even '80s that you've so often dismissed as irrelevant. There are two ways to read that statement:

1) That you're speaking of "the American right/left" as a whole, in which case the latter part is untrue because most of the American left has opposed communism as long as it's existed, or

2) That you're speaking of various aspects of "the American right/left" rather than the whole of either, in which case the FORMER part is untrue, because the Bund and other such Nazi fifth columns had an exclusively American membership and wholly Nazi objectives, and the support conservative America First leaders like Lindbergh gave the Nazis is well known (while other conservative America First leaders like Senator Nye were probably just hardcore isolationists).

It simply doesn't hold water; there are too many contradicting facts, and simply saying, "I won't discuss that" or just "nuh uh!" won't unmake them. You're arguing ideology against facts, and you can't win that argument, though you can declare victory as long as you like.