The San Francisco Chronicle reported a former Uber security specialist accused the company of dispatching a team of spies to steal its rivals’ trade secrets and using shady tactics to thwart its competition in the ride-hailing market, according a letter unsealed Friday by a federal judge. Former Uber manager Richard Jacobs, who was fired earlier this year, made the claims in a 37-page letter that sought a payoff for being forced out of the company. The letter has already reshaped a high-profile trial pitting Uber against Waymo, a Google spinoff that accuses its rival of stealing its self-driving car technology.