Masked federal agents grabbed a day laborer off the street outside a Home Depot in Los Angeles … locals who saw the apprehension were pissed … and it’s all on video.

TMZ obtained video showing a swarm of feds — some wearing U.S. Customs and Border Patrol vests — pulling up in 3 SUVs and questioning a man who was parked on the curb in a hauling truck, looking for work.

The incident happened Monday morning across the street from the Home Depot in Playa Vista … and the agents are on video claiming the guy told them he was an illegal immigrant.

After a few minutes of back-and-forth, the agents grab the man out of his truck, place him in handcuffs and throw him in the back of an SUV … all while a crowd gathers and hurls insults at the feds.

There’s a lot of tension between the public and the agents … and at one point, one of the agents is on video confronting and shoving a bystander who was recording.

In our video, you see the agents take the man from the hauling truck … and the feds also multiple other workers on the same street.