BLM would exist without the nazis and the white supremacists due to the whole law enforcement excessive force issue. And that ebbs and flows and in time will fade. But the rest of the left leaning groups would wither away for lack of need if the alt right wasn't instigating things like Charlottesville.
What a dumb post. The Marxist and communist groups have been creating and backing these radical groups since the 40's. They will continue pushing this country to a more fascist type gov and useful idiots like you will continue to carry the mantle for them.