Since the election of President Trump and the rise in racist and white supremacist activity, the militant antifascist movement known as antifa has become increasingly active and high profile in the United States. This book analyzes the tactics, culture, and practices of the movement through a combination of social movement studies and critical criminological perspectives. Based on extensive fieldwork and interviews with activists, this book is the first scholarly sociological analysis of contemporary antifascist activism in the United States. Drawing on social movement studies, subculture studies, and critical criminology, it explains antifa's membership, their ideology, strategy, tactics, and use of culture as a weapon against the far right. It provides the most detailed account of this movement and also cuts through much of the mythology and common misunderstandings about it. This book will be of interest to scholars and students in sociology, political science, anthropology, criminology, and history; however, a general audience would also be interested in the explanation of what drives antifa tactics and strategy in light of the high-profile conflicts between fascists and anti fascists.