Amanda Trebach, a Los Angeles resident who volunteers to document immigration enforcement operations on Terminal Island in San Pedro, found herself early Friday morning on the wrong side of an enforcement action.

She was pinned to the ground, handcuffed and put into an unmarked black van by masked federal agents.

The arrest put a spotlight on the risks faced by a growing number of volunteers who work to document immigration enforcement actions across Southern California.

Trebach is a member of Unión del Barrio, an immigrant rights organization, one of several advocacy groups that conduct local patrols to respond to and document immigration enforcement operations in Southern California.

For the last several months, the registered nurse, alongside members of the Harbor Area Peace Patrol,

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