I've walked into an antifa/communist bookstore before, which if you don't know each city's antifa HQ is in either a used bookstore or a shitty cafe. They were telling me about their ideals politics and future plans within 10 mins. Maybe it's because i looked like some kind of fag to them though and they thought i'd fuck their ugly GF's.Sure, but I find it unlikely that all of these people have the discipline to not talk about it online or not be on the radar.