For nearly all the twentieth century there was a dynamic left in the United States grounded in the belief that unrestrained capitalism generated unacceptable social costs. That left crested in influence between 1935 and 1945, when it anchored a coalition centered in the labor movement, most significantly within the Congress of Industrial Organizations (CIO). It was a prominent voice in the Democratic Party of the era, and at the federal level its high point may have come in 1944, when FDR propounded what he called “a second Bill of Rights.” Among these rights, Roosevelt proclaimed, were the right to…