I despise ANTIFA. But is violence against opposition the sole determining factor for who is or is not a fascist?
Oh of course not, friend, but in my not so humble opinion, fascism is effectively "Corporate Cronyism" + "Nationalism" + "Violent Authoritarianism" + "No Civil Rights". In these cases Antifa is using violence to suppress free speech they do not agree with and are silent on the first two issues as any leader that they would approve of (like perhaps Obama?) they would support in classic Nationalist/Authoritarian fashion and ignore his use of corporate cronyism to stay in power.
Todays Far Left is more fascist than communist ever since they threw in the towel and accepted capitalism as the economic engine of preference.