Art can be a powerful avenue of resistance to oppressive governments. During the dictatorship of Augusto Pinochet in Chile, some of the country’s least powerful citizens—impoverished women living in Santiago’s shantytowns—spotlighted the government’s failings and use of violence by creating and selling arpilleras, appliquéd pictures in cloth that portrayed the unemployment, poverty, and repression that they endured, their work to make ends meet, and their varied forms of protest. Smuggled out of Chile by human rights organizations, the arpilleras...