In this fourth seminar of Coöperism 13/13, we turn to Brazil’s Landless Workers Movement and other political movements in Brazil to explore how cooperation infuses these social movements. Today, Brazil’s Landless Workers Movement (MST) may be one of the largest social movements in Latin America. Reports suggest there are as many as 460,000 families who are part of the movement. Those families work and live in collectives on unused lands they have appropriated, taken over, settled, and turned into productive agrarian farmland. They have done so most often through forms of cooperation, operating as large collectives.