SAN SALVADOR ATENCO, Mexico -- Six weeks after rebellious peasants forced the government to scrap plans for a $3 billion airport on their land, new conflicts are brewing in this town on the edge of Mexico City. The most radical farmers have established a "People's Council," declaring the elected municipal authority defunct and putting themselves on a collision course with the state and federal governments. Many believe their efforts can serve as a model for other communities with grievances against the state. But others in town have grown weary of the revolutionary rhetoric and want to return to the way...