Most of the ones that participated in the march in Charlottesville were genuine new groups: Identity Evropa, Vanguard America, Traditionalist Worker Party etc.

And most of their membership is not a split from KKK etc. It's new people, often with very different backgrounds age- and education-wise. And one distinguishing thing about them is that they put a lot more emphasis on politics and outreach compared to KKK, and they openly reference fascist and Nazi ideas - which is to say, they don't just talk about white supremacy, but they talk about fascist ideals for governance etc.

Make no mistake, this is a new wave of political right-wing authoritarianism in US, not the same old.