@KF6re5M4s In Weimar Republic (1920/1930s Germany), Antifa had street battles with Nazis.
Good on them, glad they did - until you realize WHY they did. They & Nazis viewed each other as competitors.
Nazi is short for "National Socialist German Worker's Party" - they viewed themselves as left-wing, thought government should have programs to help poor, save environment, liberate women, control business etc. They went on to found Volkswagen.
"Right wing", to Nazis back then, meant that you were either a UK-USA libertarian capitalist or a Catholic monarchist. Nazis hated both, like USA Dems today. What's different between those Nazis & USA Dems today, is only 1. Nazis had actual death camps for their opponents (where USA libs/Dems merely imprison their opponents), and 2. Nazis actually liked their country (Germany).
What's different between Nazis & original Antifa was, Antifa preferred to be "internationalist" or pro-Soviet Union - which you could call, pro-Russia. Nazi Germany was famously anti-Russia and anti-Soviet and sent tanks rolling across Ukraine to prove it, much like Germany wants to do here in 2026.
Back then, Nazis & Antifa fought each other to the death - one wins, one loses - in spirit of, "There Can Be Only One" group who rule Germany in the name of Socialism & set its foreign policy.
Both movements survived in USA through many generations, with changes to be English-speaking & more local. Today, Antifa looks at anybody who is even slightly to their own right and says "You're a Nazi" - to mean they have right to hit you, maybe kill you.
Both movements remain terrorist killers, and it takes some twisted ideology to have that.