The video , taken Sept. 15, shows a man wearing a white T-shirt and black pants, his hands cuffed behind his back. He’s being walked out of the Wiley W. Manuel Courthouse in Oakland. Flanked by three men — presumably U.S. Immigration and Customs Enforcement agents — in plain clothes, the man is led to an unmarked black SUV. One of the agents appears to have a firearm on his hip.

From there, a masked man armed with a pistol — wearing what appears to be a green bulletproof vest with the words “Police HSI” on the back — opens the door to the back seat, and the man in handcuffs is made to get inside. (HSI stands for Homeland Security Investigations , the investigative arm of the U.S. Department of Homeland Security.) The man was whisked away to an immigration detention facility, accordi

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