In the Depression summer of 1932, some 45,000 veterans of World War I descended on Washington to demand the bonus promised them eight years earlier for their wartime service. They lived in shantytowns, white and black together, protested and rallied for their cause. Roy Wilkins saw the model for racial integration here; J. Edgar Hoover built his reputation against the radicals. President Hoover, Army Chief of Staff Douglas MacArthur, and others feared...