Earlier this year, hundreds of thousands of Brazilians marched in São Paulo, Rio de Janeiro, and Belo Horizonte, calling for improved public-health services, better schools, and cheaper, more efficient public transport. And Colombians and Peruvians from all walks of life (especially peasants, farm owners, and mineworkers), as well as Mexican school teachers, now occupy the centers of Bogotá, Lima, and Mexico City, disrupting inhabitants’ daily lives and creating serious problems for the authorities.