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Spies Who Chased Terrorists Join Banks to Hunt for Rogue Traders

Bryon Linnehan spent more than two years chasing bad guys around Iraq as a U.S. military-intelligence officer. Since May, he’s been using skills he honed on the battlefield to monitor electronic communications inside Barclays Plc. Desperate to avoid more costly run-ins with regulators, investment banks are hiring former intelligence professionals like Linnehan to scrutinize virtually all aspects of their employees’ working …