This book contributes to the current scholarship on migration by providing a window into the lives and experiences of those behind the facilitation of irregular border crossing journeys. Based on fieldwork conducted among in Arizona - the main point of entry for irregular migrants in the United States by the turn of the 21 Century - this project goes beyond traditional narratives of victimization and financial exploitation and asks: who are the men and women behind the journeys of irregular migrants worldwide? How and why do they enter the human smuggling market? How are they organized? How do they understand their roles in transnational migration? How do they explain the violence and victimization so many migrants face while in transit? This book is suitable for students and academics involved in the study of migration, border enforcement and migrant and refugee criminalization.