A Cubs fan who flashed a hand gesture associated with white supremacists has been banned for life by the Cubs in the latest incident that shines a light on Wrigley Field’s longstanding reputation for racist behavior. After a daylong investigation Wednesday, the Cubs found the fan who used the gesture behind NBC Sports Chicago reporter Doug Glanville during Tuesday’s broadcast. Team president of business operations Crane Kenney says the fan, who was not publicly identified by the Cubs, will be banned from Wrigley Field. During the game Tuesday, Glanville, who is black, stood beside the Cubs’ dugout, talking on-air...