President Donald Trump moved Monday to classify the left-wing, anti-fascist movement known loosely as antifa as a domestic terrorist organization, opening up a new front in his battle with political foes and raising legal and ethical questions about how the U.S. government can prosecute a movement.

Antifascist activism and violence has spread during the Trump years. Since he took office in 2017, its targets have broadened as militant anti-fascist protesters – concealing their identities with masks, dressing head to toe in black – have sparred with police to block a right-wing provocateur speaking at UC Berkeley, confronted alt-right demonstrators with sticks, shields and chemical irritants in Charlottesville, Va., stormed a federal courthouse while protesting police brutality in Portland,

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