rom the school balcony, Marcos Cunha had an unobstructed view of Santa Marta, the Rio de Janeiro neighborhood that had been giving his fellow police officers so much trouble. Looming above him was the rocky peak that police once rappelled down to raid the shantytown. At eye level sat the bullet-pocked Church of the Nazarene, where drug dealers had fired at oncoming police on another day. And spread below him were the clustered shacks and tangled wires of this largely ungoverned place on a hillside of the capital.Full Story