The Black Bloc: Inside America’s Hard Left: The left-leaning anti-fascist movement—or Antifa—has been around for decades, popping up in North America and Europe in response to rising white nationalist or fascist sentiments. Now, Antifa has made a resurgence in the US, where members clad in masks and nondescript black clothing physically confront groups of white supremacists and neo-Nazis who've started organizing in cities around the country.