PORTLAND, Ore.—U.S. Attorney Billy J. Williams announced today that a Portland man has been arrested for his role in an overnight attack on the Hatfield Federal Courthouse.“The lawless and violent acts of extremists across the political spectrum cannot continue. Violence directed at federal, state, and local law enforcement and property destruction is inconsistent with the aims of social justice,†said U.S. Attorney Williams. “These are criminal acts and individuals who engage in them will be held accountable.â€Rowan M. Olsen, 19, aka Kiefer Alan Moore, was arrested by Federal Protective Service officers in the early morning hours of July 3,...