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.

Since the 2016 presidential election, Antifa has become a staple at alt-right and Trump-related rallies that often result in violence. VICE met up with a few members of Philadelphia’s “Black Bloc”—the term used for a collection of autonomous Antifa organizations—to find out more about their ideology, tactics, and individual reasons for participating in this high-risk form of activism.