There were a few businesses around my area that were gutted of their staff by ICE. Within two days they were fully staffed again and back to business as usual. They need to go in and shut down operations for a week until they can provide the documentation that each person used to get their job. Let the companies start seeing that impact and I bet the jobs for illegals dries up.
And this is not just illegals from Central America; there are lots of people who came to the US on a passport or VISA that never returned home. They are just as illegal as a person who walks through the desert.