The Landless Workers Movement (Movimento dos Trabalhadores Rurais sem Terra, or MST), for many years the largest and most active social movement in Brazil, challenges landowners and authorities and agitates for a broad agrarian reform. It organizes unemployed and landless farmworkers to take over idle farmland and turn it into productive farms. It grew out of land occupations beginning in 1978 in Brazil's southernmost state of Rio Grande do Sul, led by activists from the Catholic Church's Christian base communities and some Protestant churches under the inspiration of liberation theology. The movement was formally founded in 1984, near the end of a 21‐year military dictatorship. It acts nationwide across Brazil's vast continental expanse, spanning a great variety of local social, economic, and environmental conditions, so its practice varies from place to place. Focusing during its early years on occupying farmland to force the government to undertake a broad agrarian reform, it has shifted in the twenty‐first century to strengthening communities of farmers by consolidating production and political power on the properties it has occupied.