Dunno what you're talking about here. The South is and has always been about as far the opposite from Marxism as is possible to get.
The South voted for Wilson and FDR, both traitors and Socalists. You can make your arguments, but that is what the scum Wilson and FDR were. Now, happily, the South has turned into a center of Conservatism. The New England and Northeastern States have now turned traitor.
Some Southern Conservatism began to emerge in the 1938 Elections. It took a good deal of time to develop. And it was not mainly about Segregation, that is a leftist lie.