Why the United States has not developed a permanent socialist movement has perplexed activists and theorists for more than a century. Paul Le Blanc takes up that query as an activist who wants to see an anti-capitalism mass movement take shape in twenty-first century America. To that end, he investigates some of the moments when the possibility of a significant left presence in the United States seemed at hand. He focuses on what made those movements viable and what thwarted their long-term success. The volume’s fourteen essays were written over a period of thirty years, from 1986 to 2015.