Also: Here is an account of anti-communist anti-authoritarians singing The Internationale in 1989 when in police custody. Odd they would sing that when you characterized the song as a singularly communist anthem. One possibility is that every anti-authoritarian member of Capitalized Antifa isn't a communist after all.
https://books.google.com/books?id=so474D6P9LsC&pg=PA22&lpg=P...