The whistle blows in short bursts: PHWEEE! PHWEEE! PHWEEE! PHWEEE! Code: ICE is nearby. Then comes the long blast: PHWEEEEEEEEEEE! Code: ICE has taken someone. These are the codes immigrant rapid responders are using to alert their neighbors and co-workers to ICE sightings and kidnappings. Federal agents are armed with military-style weapons. Up against them, everyday people have whistles, boundless courage, and the acronym S.A.L.U.T.E. for information to gather: the size of deployments of federal agents, the actions they are taking, the specific location, the uniforms they are wearing, the time, and the equipment, or type of weapons. At trainings...