carsick_alastor

Antifa is a label, typically self-appointed. There must be thousands, probably tens of thousands of groups that identify as antifa, most of them confined to a region or a city.

It's possible to make generalisations across all the various groups, but you're going to have huge variance across them -- in pretty much all areas, including internal structure, attitude towards violence and political positions.

Of course groups are aware of one another and cooperate (as well as conflict, I assume) in an anarchic way, but there is no centralized power or executive. It's certainly not a single organisation.

From an organisational perspective, sports fan clubs are rather similar (mostly independent of one another, mostly local, very heterogeneous in how they work internally and interact with the world).