A “Little” strike in this industry led to the 1937 Memorial Day Massacre in Chicago. The Supreme Court blocked the Truman administration’s attempt to seize properties in this industry (10[1])in the Youngstown case. (10[1])Alexander Berkman was arrested for attempting (-5[1])to stab (-5[1])an executive in this industry, Henry Clay Frick. (10[1])A businessman in this (-5[1])industry who funded the American Anti-Imperialist League described the duties of philanthropy in “The Gospel of Wealth.” Pinkerton agents (10[1]-5[1])engaged in a shootout with striking workers in this industry in Homestead, Pennsylvania. (10[1])For 10 points, Pittsburgh was a center for what industry (10[1])in which Andrew Carnegie became a billionaire? ■END■ (10[1]0[1])