This monograph examines the profound changes sweeping Michoac?n in recent years that have facilitated the rise and power of drug traffickers; the origins and evolution of La Familia, its leadership and organization, its ideology and recruitment practices, its impressive resources, its brutal conflict with Los Zetas, its skill in establishing dual sovereignty in various municipalities, if not the entire state; and its long-term goals and their significance for the United States. The conclusion addresses steps that could be taken to curb this extraordinarily wealthy and dangerous criminal organization.