What about the most obvious double-loyalty - French Canadians?
French Canadians are another interesting example of Communists supporting a "national liberation movement" for white European chr*stians (giving the lie to the racialists who insist Communism is a racial conspiracy against European civilization). Quebec was historically very anti-Semitic and even pro-Nazi in WWII but nevertheless (like the Irish, Basques, Scots, Welsh, Bretons, Cornish, etc.) was blessed by the Left with a "national liberation movement." Ironically, despite its current Leftist orientation (the Parti Quebecois is a member of the Socialist International) our neo-Confederates are big fans of French Canadian nationalism (as they are of Celtic nationalism and bilingualism in the British Isles).
So when do poor Southern whites get a NLM? Maybe the Cajuns would be a good place to start!