As Chicago endured a devastating surge in gun violence last summer, scores of people with long rap sheets stood atop the Chicago Police Department’s secret watch list, newly obtained records show. One of the men had been arrested 12 times for violent crimes, all before turning 20. He’d also been charged with illegal gun possession. Two others each had been arrested eight times for violent crimes and caught three times with guns. Another man had been busted three times for illegal guns, racked up four arrests for violent offenses and been shot twice.