If the Trump campaign has any say in it, Americans should learn the name of Gianfranco Torres-Navarro. According to U.S. authorities, Torres-Navarro is the leader of a Peruvian crime gang and is thought to be personally responsible for 23 murders. He is a notorious figure in Peru, where he is known as “Gianfranco 23,” clearly “a reference to the number of people he is alleged to have killed,” according to the Associated Press. He has a girlfriend who, also according to AP, “has a sizable following...