Over a decade ago, Jorge Castaneda wrote the classic Utopia Unarmed, which offered a penetrating and comprehensive account of the Latin American left's fate at the end of the Cold War. Since then, the left across Latin America has travelled in paths no one could have predicted. Latin American nations from Mexico to Argentina wavered for years between leftism and American-supported neoliberalism, but in recent years the left has experienced a tremendous resurgence throughout the region. However, the left is not unified, and as Castaneda, Morales, and their contributors show, it has...