Good interview with Mark Bray on Democracy Now! in which he does the important work of correcting the liberal media's pronunciation of antifa (seriously, while I'm sure there's a lot of regional variation in pronunciation, every time I hear anTEEfa I can't help but think the speaker is an uninformed pundit (like "Black Block Anarchist" after Seattle '99). Amy Goodman even changed her pronunciation at the end of the clip, because she's a pro).
Part 2 is here: https://www.democracynow.org/2017/8/16/part_2_antifa_a_look_at
He also has an article up on the WaPo website called "Who are the antifa?": https://www.washingtonpost.com/news/made-by-history/wp/2017/08/16/who-are-the-antifa/