text: "Many activists affiliated with the loosely organized Antifa movement consider themselves anarchists or socialists. They often wear black and take measures to conceal their identity."
  
  Nope, that's Black Block, which is an anarchist based protest tactic. 
  
  Naturally often allied with Anti-fascist, but not necessarily the same people, and you'll find Black Block activists at lots of protests that have nothing to do with fascists, while Antifa is a group not just a tactic, specificallyy targeted at Fascism, and does not tend to appear elsewhere. 
  
  They don't wear black, and their origins are rooted in early communists, socialists and progressive Christian orgs, anarchists might tag along but by definition aren't org joiners.