This is a formal institution of a caste system. Illegal aliens have always done all the work Americans won't do for illegal alien wages. This bill legitimatizes a two tier labor system making it impossible for US workers to ever demand a larger share of the national economic pie. A huge supply, of cheaper foreign labor makes it impossible for US workers to demand higher wages.
When Wilson pushed through the federal income tax, he transferred much of the national tax burden from importers to the middle class and made it lucrative to import cheaper foreign made products. Since then, NAFTA type agreements have made the importation of foreign made products even more lucrative. President Obama was even promoting the TPP in his State of the Union speech. We are now at the point of bringing in foreign labor to completely undermine US wage earners.