Today in Labor History April 21
1500s Today in Labor History April 21, 1506: The Lisbon Massacre ended. During the three days of slaughter, Portuguese Catholics killed over 1,900 suspected Jews. April 21, 1545: Juan de Villarroel filed the first mining claim at PotosĂ, in what is now Bolivia. The mine was on Cerro Rico mountain, which had one of the richest …