Idk about European antifa, I hear they are a little more militant over the pond. It's not like antifa here is a group. This is definitely relevant to the antifascist actions taken by the GDC and various trot parties. All the antifascist actions I've taken part in have indeed involved broad coalitions of do gooders, ie bourgeois orgs marching with alleged communists. It's a lose lose in terms of how those kind of demos play out. I guess the one good thing is that if we outnumber them then the liberals see which side the cops are on. There's also a false consciousness though that that breeds, because it feels like you've scared them off and are doing something productive, when in reality they just failed to mobilize (as they frequently do) because they aren't a real threat.