Antifa is not just an American movement — it’s international. You will often see Antifa referred to as the “black bloc,” because they use an anarchist tactic of wearing all black to obscure their identities at protests, such as the G20 in Hamburg this summer. (Though “black bloc” members are usually ardently anarchists, whereas Antifa might draw people with a variety of things on their list to protest, so the terms aren’t entirely interchangeable.)