here they dox Nazis and tip off law enforcement. they step in throw down with Neo-Nazis and KKK and Proud Boys when those thugs show up to intimidate protesters. they run local mutual aid groups and other community outreach programs
they vary from region to region and country to country b/c it's decentralized (it's anarchist driven after all) - there's no rank and file, payroll, offices, etc. i'll take dumb street fighters fucking up properties over mass shooters targeting anyone who isn't white or right-wingers.
Yes, here too. Antifa people have done some amazing things in terms of reporting right-wing terrorists to law enforcement, debunking whole clans of those fuckers, possibly saved lives. It's a big sub culture here too, with lots of different people. Dumb ones, smart ones, fake ones, authentic ones, etc., usually open minded kids, but lots of nutters as well. Autechre played in a venue in Leipzig that's typically a leftist/antifa venue, was a great show