Based on the article from The Boca Raton Tribune, featuring a Reuters explainer about the anti-fascist movement known as Antifa and the legal challenges surrounding former President Donald Trump's attempt to label it as a domestic terrorist organization. The article details how Trump vowed to take action against Antifa following the murder of a conservative activist, despite the lack of public evidence linking the group to the crime. It clarifies that Antifa is a decentralized movement without formal leadership, often described as an anti-fascist ideology, which makes the proposed terror designation both legally and constitutionally dubious under existing U.S. law. Furthermore, the piece describes Antifa's structure as a collection of loose, independent local groups that engage in "direct action," sometimes involving violence, but notes that U.S. law enforcement has never officially connected the group to a terrorist incident.