In Britain, Antifa was a continuation of Anti-Fascist Action (the reason why I sometime capitalise it as AntiFA) which started in 1985 after the Anti-Nazi League ended operations. They have been in existence since at least 2005.
There is also the Anti-Fascist Network, who could be argued to be the next generation of antifascist activists.
I know some people like the idea of a tangible group that they can join and go on peaceful marches with, but with the things that antifa does that’s how you get infiltrated by cops and fascists and peoples lives get put in danger (both antifa and the people they protect.) Join the Iron Front or something if you want that kind of organisation though.
I have survived living somewhere where there were fascists and no antifa. Never Again!
