LOS ANGELES —

At a Home Depot parking lot, a man patrols on a bicycle for federal immigration agents, toting a megaphone on his hip so he can blast a warning to day laborers waiting to land a landscaping or construction job.

The workers from Mexico, El Salvador and elsewhere carry whistles to also sound the alarm, while activists swap details over two-way radios about whether cars whizzing by could be unmarked vehicles carrying officers preparing for a raid.

(Video above: Sacramento teen recounts detention during Border Patrol raid.)

Their work is cut out for them. Agents have raided the lot outside the 108,000 square-foot Home Depot store in the Van Nuys neighborhood of Los Angeles at least five times since June, rounding up some immigrants and sending others running in search of sa

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