[Twosugars]

The antifa (/ænˈtiːfə, ˈæntiˌfɑː/)[1] movement is composed of left-wing, autonomous, militant anti-fascist[7] groups and individuals in the United States.[11] The principal feature of antifa groups is their use of direct action,[12] with conflicts occurring both online and in real life.[13] They engage in varied protest tactics, which include digital activism, property damage, physical violence, and harassment against those whom they identify as fascist, racist, or on the far-right.[20]

Activists involved in the movement tend to be anti-capitalists[21] and subscribe to a range of ideologies, typically on the left. They include anarchists, socialists and communists along with some liberals and social democrats.[28] Their stated focus is on fighting far-right and white supremacist ideologies directly, rather than through electoral means.[27]
Wikipedia

I mean our soldiers fought fascists with violent means. Antifa is simply continuing the tradition