It has been a century since Frederic Thrasher researched his pioneering text on youth gangs in Chicago. In it he depicts gangs as a street-based phenomenon that emerged from the combined forces of urbanization, migration, and industrialization—with new migrant groups seeking to find a toehold on the American Dream. Gangs were discrete and highly localized, drawing on names from popular culture and the neighborhood, seeking ways to survive and thrive amid the disorganization of the emerging city. In the 21st century, street gangs have been identified in urban contexts all over the world and have become increasingly viewed as a transnational phenomenon that is qualitatively different from Thrasher’s neighborhood groups. Processes of globalization have created a degree of flow and connectedness to urban life that is unlike any other stage in human history. Yet a close reading of Thrasher shows that some of the key themes in the study of gangs in a global context—urban exclusion, grey economies, human mobility, and cultural flow—were presaged in Thrasher’s work. In a global era, however, these processes have intensified, amplified, and extended in ways that could not have been predicted.
We elaborate the spatial, economic, social, cultural, and technological implications of globalization for gangs across five principle areas: (1) Gangs in the Global City; (2) Gangs, Illicit Markets, and the Global Criminal Economy; (3) Mobility, Crimmigration, and the “Transnational Gang”; (4) Gangs and Glocalization; and (5) The Gang Mediascape. Taken together, these themes seek to offer both a conceptual vocabulary and empirical foundation for new and innovative studies of gangs and globalization. Empirical evidences from Europe, the United States, and beyond, emphasize the uneven impacts of globalization and the ways in which national and cultural dynamics are implicated in the study of gangs in the 21st century.