Good question. When a mainland Chinese development company started pulling down houses and building luxury condos in my neighborhood in Pasadena, California (next door to me, in fact) they brought in labor from central America, specifically Guatemala and El Salvador.  I went next door and asked them, since  I speak (some) Spanish. Their foreman was brought in from Mexico. They didn't even pay the work crew that demo'd the houses, they were paid with the value of the reclaimed wood. And they weren't given equipment - they dropped the houses with their bare hands, not even gloves were provided. They literally spent two days ripping it down by grabbing the walls and tearing and kicking. It was amazing how cheap these developers were going. I've never seen anything like it.