I want to read this book.

Read about it here:

Working in the Shadows

Some things to keep in mind about unskilled workers:
-Above and beyond U.S. unskilled workers, there is demand for more than 500,000 unskilled workers each year. This shows that there is demand for migrant labor in the U.S.
-5,000 Visas are available for unskilled workers each year. This is unreasonable based on the demand stated above.
-Only three of the Visas for unskilled workers are offered to Mexican workers.
-The backlog for legally obtaining these Visas goes back to 2001; so, workers that applied for the "other workers" Visa from Mexico in 2001 are just now being processed. Take a look at the Visa Bulletin for specifics about Visa processing times.