A “Little” strike in this industry led to the 1937 Memorial Day Massacre in Chicago. The Supreme Court blocked the Truman administration’s attempt (10[1])to seize properties in this industry in the Youngstown case. (10[1])Alexander Berkman was arrested (-5[1])for attempting to stab an executive in this industry, Henry Clay Frick. (10[1])A businessman (10[1])in this (10[1])industry who funded the American Anti-Imperialist League described the duties of philanthropy in “The Gospel (10[2])of Wealth.” (10[1])Pinkerton agents engaged in a shootout with striking workers in this industry in Homestead, (-5[1])Pennsylvania. For 10 points, Pittsburgh was a center for what industry in which Andrew Carnegie became a billionaire? ■END■ (10[1])