This would 100% never happen in the world we live in today. I think it'd be considered too much for even the Attitude Era. The Nation of Domination might have talked about black power and all, but seeing a Neo-Nazi stable (possibly complete with swastika tattoos across their chests or whatever) would be too much for most people. There once was a biker-gang type of stable in the AE called The Disciples of Apocalypse, and while they never said they were white supremacists, they did strongly hint at it, what with two-thirds of the group being skinheads and with their primary feuds being with racial groups like The Nation of Domination (all-black gang) and the Los Buricuas (all-Hispanic gang.) That's the closest you're likely ever getting to it. A writer even proposed to Vince back in 2004 about doing a Neo-Nazi character and it's said that even McMahon was so shocked by the idea that he got up and left the room.
It's fun to imagine an alternate universe though where there were no limits or restrictions (or only a few of them) and wrestlers were allowed to say and do whatever they wanted (basically an R-rated movie type of programming, where all type of cursing and nudity is allowed) because an Edward Norton-type of character like from the movie American History X would be an excellent heat magnet, but it just isn't feasible in the real world. Many would be turned off and never watch again, and some would likely jump the barrier and try to harm the person for real.