Complicating the social theory that presumes increased urbanization means greater political progress and inclusion, Simeon J. Newman’s analysis of working-class political participation in twentieth-century Mexico City unveils how rapid urban concentration can lead to political clientelism. While many rural migrants to the city brought revolutionary ideals, these were stymied by their increased dependency on local leaders to mediate between poor urban dwellers and elected officials and government bureaucrats for services and land security.