There's no simple solution here. Part of the Alt-Right platform, as I have it, is that the media (be it news or social media) is corrupt and bent on silencing them. Suspending their accounts would only reinforce that belief.
I would also hope that we can come up with a solution that doesn't involve hindering others's ability to communicate. Even if it is the simplest and most effective tactic, it seems like that's just fighting the symptoms rather than the disease.