Who Is David Huerta, the Labor Leader Arrested in Los Angeles?

The arrest of the prominent California union leader David Huerta on Friday as he protested an immigration raid in Los Angeles quickly drew condemnation from national labor activists and Democrats.

Mr. Huerta — the president of the Service Employees International Union of California — was released on Monday but is still facing charges. He has become a symbol for those protesting the Trump administration’s immigration raids. The protests were further inflamed by the president’s decision on Saturday to send 2,000 National Guard troops to Los Angeles to quell demonstrations, followed by his decision on Monday to more than double that deployment.

Here’s what we know.

Why was Mr. Huerta arrested?

On Friday, Mr. Huerta was detained by federal agents while protesting an immigration raid at a work site in downtown Los Angeles. He was charged with one count of conspiracy to impede an officer.

According to a criminal complaint, federal agents conducted search warrants at four businesses suspected of employing undocumented immigrants and falsifying employment records.

Mr. Huerta arrived at the work site in the early afternoon, with protesters already gathered. Mr. Huerta and others were accused of “communicating with each other in a concerted effort to disrupt the law enforcement operations,” according to the criminal complaint.

The complaint also accused Mr. Huerta of yelling at officers and sitting cross-legged in front of a vehicular gate, as well as urging demonstrators to “stop the vehicles,” and continue protesting.