Rare is it that Dabo Swinney issues threats. The Clemson football coach dances with his players and takes his assistants on annual skiing trips. Fear is not part of his playbook. But Swinney makes an exception when it comes to safeties coach Mickey Conn, whose oldest son, Brodey, plays on the same football and baseball teams as Swinney’s youngest son, Clay. “Dabo says, ‘If you don’t go to the games, I’m going to fire you,’” Conn said. And so Conn goes to the games. He values his employment. He then returns to the Tigers’ facility grateful to work for a...