Virtually every decision had to go to the top for approval, with the goal of limiting the low-level officer’s exposure to temptation. To reinforce the hierarchy, specialized units were created to deal with such problems as drugs, youth, guns, and gangs. As Bratton described it, [The department] was divided into little fiefdoms, and some bureau chiefs didn’t even talk to each other…. Each bureau was like a silo: Information entered at the bottom and had to be delivered up the chain of command from