On Saturday, Oct. 10, a shouting match near the Denver Central Library ended with a burst of pepper spray and a fatal gunshot in broad daylight. The victim: Lee Keltner. The shooter: Matthew Dolloff. Keltner and Dolloff would likely be unknown to one another — and the rest of the country — had it not been for the collision of political forces in downtown Denver that day. But now they are at the heart of a conflict among groups whose names differ depending on whom you ask: patriots and communists, fascists and Antifa, left and right.