Mexico’s cult of La Santa Muerte, or Holy Death, has turned murderous. Police arrested eight people last week, all allegedly followers of the cult, for the ritual sacrifice of two boys and a woman over the past four years. “They sliced open the victims’ veins and, while they were still alive, they waited for them to bleed to death and collected the blood in a container,” said José Larrinaga, a spokesman for Sonora state prosecutors. The cult, which mixes Catholic and indigenous beliefs, has become much less secretive over the past decade, and has spread in working-class neighborhoods and shantytowns until it now numbers some 2 million followers. Before these murders, the cult was not known to practice human sacrifice.