Antifa and BLM are the modern-day KKK, which was their former Democrat terrorist arm.
Actually they are much closer and somewhat related to the terrorist group Red Army Faction.
Both began in Germany, both used one object as their justification and both were very dangerous.
Red Army Faction used the Vietnam War as justification for murder.
Antifa used their twisted definition of Fascism as justification for riots.
Both were funded by theft and private donations.
Both were backed by the MSM at the time.
Both were radical left wing organizations.