That's not true. Black Panther was a group. CNT was a group. Even on the other side of the spectrum, KKK and Boogaloo Boys are groups. They all have a name, membership, and identification.

There's no "antifa" organization because antifascism is a concept with different branches of thoughts and practices. Calling antifa an organization is akin to calling "science" an organization. Sure a dictator can arrest millions of people of the "science" terror organization and jail them for their dangerous subversion, but that doesn't make the "science" organization any more real.