James Crown, one of the wealthiest men in Chicago, is aiming to use his national clout in business to try to fight crime in the city. The ambitious goal? To reduce the number of killings in Chicago to fewer than 400 a year within five years. On Thursday, Crown — whose family was ranked 34th-richest in America by Forbes in 2020, worth an estimated $10.2 billion — is announcing a crime-reduction strategy focused on getting jobs for thousands of people in the most dangerous parts of Chicago, providing millions of dollars for civilian violence-intervention programs, strengthening law enforcement agencies and...