Blackened armored personnel carriers racing down urban avenues; teams of police equipped with military-grade assault rifles performing raids in search of people matching a vague description. For days on end, residents of certain neighborhoods fear going outside and rely on an informal network of neighbors to let them know if another raid is coming. These images are jarring, but have come to define the U.S.’ strategy to crack down on undocumented immigrants, especially those living in so-called