Rumor vs Reality

Antifa is a collection of small, independent groups, not an actual organization. Their overall goal is to oppose Nazis and similar groups. Antifa groups often protest against white nationalist demonstrators. Sometimes that leads to violent clashes, but no one tied to Antifa has killed anyone in the US. Antifa groups are not threatening suburbs and are not setting forest fires.
References
Anti-Defamation League: Who are Antifa?
Congressional Research Service: Domestic Terrorism: An Overview
Reuters: U.S. prosecutors do not charge Portland protesters with antifa ties
USA Today: Fact check: Oregon, Washington fires were not set by anti-fascist activists
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