AntiFa are certainly the most consistently intimidating and violent, even if their violence hasn't spiked to the same extremes as whichever group we attribute murders to. In fact, AntiFa use tactics much closer to terrorist tactics with stalking, intimidation and secretly planned action which can create a "we will strike anywhere at anytime and you won't know until it's happened" climate.
People like to defend AntiFa by contrasting them to the Charlottesville death but before that death what was the logic behind siding with AntiFa? They were doing all the same stuff before that death and in many ways are responsible for the reciprocal violence that eventually lead to that death (of course the driver is ultimately responsible for his own actions). People want to whitewash the actions of AntiFa with a single death at a rally and that's pretty ridiculous, AntiFa certainly put their fair share of people in hospital, certainly intimidated their fair share of people and go to extreme lengths to hide their identities.