What’s in a name? Even if Antifa is an idea and not a formal organization, no reason why she can’t prosecute criminals acting in combine, as these folks are, to attack government agents performing their duties under the RICO statute. That is the substance of their criminal activity. Politicians and media can call the combine the Girl Scouts but that doesn’t make the actions of criminals acting in concert any less criminal
Here is some Antifa history—before the leftists try to censor it and make it disappear: