Though now a largely forgotten holiday in the United States, May Day was founded here in 1886 by an energized labor movement as a part of its struggle for the eight-hour day. In ensuing years, May Day took on new meaning, and by the early 1900s had become an annual rallying point for anarchists, socialists, and communists around the world. Yet American workers and radicals also used May Day to advance alternative definitions of what it meant to be an American and what America should be as a...