It works perfectly, government subsidies and cheap foreign labor creates happy american farmers. Housing and infrastructure are critical to the country, just like food. The only issue is the legal limbo of selective immigration, it would be less cruel to issue visas quicker for temporary workers with most resident benefits waived than the current under-the-table dealings with illegal and undocumented migrants.

Given that enforcing the law drives the labor away, and the conditions for the workers suck, the only way it's working is to find that making things suck for people is somehow good.