Liberalism and socialism have long been understood as mortal enemies, but both developed out of the Enlightenment and are committed to the importance of reason, freedom, and flourishing for all. In What is Liberal Socialism? Matt McManus, Florian Maiwald and Paul Crider make the case for retrieving a long-forgotten tradition of liberal socialist thought. Looking at seminal thinkers from John Stuart Mill to Chantal Mouffe and John Rawls, the book lays out the strengths and weaknesses of liberal socialism in the context of the tumultuous 21st century, arguing that it may be an overlooked source of hope, one deserving of reconsideration in an era of right wing populism.