In November, Yale Law School pulled out of the U.S. News & World Report law-school rankings, saying the system was flawed. A wave of law, medical and undergraduate schools quickly followed. WSJ’s Melissa Korn reports on how the revolt was decades in the making.   Further Reading: -The Unraveling of the U.S. News College Rankings -Yale and Harvard Law Schools Abandon U.S. News Rankings Learn more about your ad choices. Visit megaphone.fm/adchoices