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The Preparedness Day Bombing in San Francisco, 1916
On July 22, 1916, a bomb went off at a parade held in anticipation of the United States' imminent entry into World War I. The suitcase bomb, which killed ten and wounded forty, was thought to be planted by labor leaders Thomas Mooney and Warren Billings, although both men were later pardoned.
In the McNamara and the Mooney cases... "'the 'perpetrators', like Csolgosz were American-born of Catholic stock, and like Csolgosz, the press frequently played them up as foreign -- in both cases, Irish -- and thus more prone to violence," wrote Kristofer Allertfeldt in his book Crime and the Rise of Modern America.