The bodies of the four young men were discovered early on Sunday, hung upside down by their feet from a bridge near a wealthy area of Cuernavaca, a leafy city about an hour outside Mexico City, where many of the nation's elite own homes. The victims' genitals, index fingers and heads had been cut off, according to a statement from the attorney general's office in Morelos state, which includes Cuernavaca. Their heads and genitals were found nearby, along with a handmade sign, the statement said. "This will happen to everyone that helps the traitor Edgar Valdes," the placard read, referring...