From Breakdown, by Bill Pronzini (1991):
Somewhere around a million illegal aliens from Mexico and Central America now live in California, thousands of them in San Francisco’s Mission District and in Daly City farther west; many have no jobs and no way of getting legitimate work without green cards from the Immigration and Naturalization Service. So the drive-by halls were born, and have flourished in the city and throughout the state.
On a dozen or more street corners in the Mission, illegals congregate early every morning, like cattle in pens, waiting for employers on the prowl for cheap labor to come driving along. A painting contractor, for instance, goes to a drive-by hall that specializes in illegals with painting skills; picks as many men as he needs for a particular job, or series of jobs, and hauls them to and from the sites; and pays them wages far below union scale – in cash, always, so there is no record of their employment. If the employer is a plumbing contractor, or runs a gardening business, or owns a factory that makes containers and requires the services of multipurpose workers, he goes to the street corner where his particular brand of illicit labor has assembled.
The police can’t do much about the drive-by halls except to disperse crowds of men that sometimes become unruly; they don’t have the jurisdiction. The INS has enacted a law carrying stiff penalties for employers caught hiring illegals, but they’re too understaffed and overworked to effectively enforce it. So both the illegals and the cheap-labor bosses make out fine: One side avoids the need for applications, interviews, union cards, and green cards; the other side avoids paying union wages, as well as withholding tax and FICA to the state and federal governments. But the big loser isn’t the IRS or the Franchise Tax Board or the INS. It’s the citizen and legitimate union worker, no matter what his race or job skill, who can’t find work to support his family because the positions have all been filled by illegals.
The real villains are the greedy employers.