It seems to me very likely that BLM and Antifa in US are planned, created and organized from the same group.
I have seen this black fist used before, and I can tell you since I was involved in 1997, that it was all financed by an external interest group.
George Soros had an interview few weeks ago I think just before riots started, saying that destabilising economy is the only way to prevent Trump from winning second term. And then, ka-boom. Violence overnight.
Whatever issues you have in US, riots are not caused by those, this is well financed and well organized.