Carandiru massacre
1992 CE.
Shown on the map at -23.508°, -46.624°.
The Carandiru massacre (Portuguese: Massacre do Carandiru, pronounced [maˈsakɾi du kaɾɐ̃dʒiˈɾu]) occurred on 2 October 1992, in Carandiru Penitentiary in São Paulo, Brazil, when São Paulo's military police stormed the penitentiary following a prison riot. The massacre, which left 111 prisoners dead, is considered by many people to be a major human rights violation.
Text from the Wikipedia article Carandiru massacre, licensed CC BY-SA 4.0.