http://www.cis.org/articles/2006/back806.html

Just part of this study....click to read complete study.

The growing inflow of illegal-immigrant workers has contributed to a fundamental breakdown in the nation’s labor laws and labor standards as the sheer volume of illegal hiring activity overwhelms what has amounted to meager enforcement levels of basic labor standards across the nation by federal and state officials from both political parties.

Absent renewed efforts to strengthen enforcement of both border security and federal and state labor laws, these new forms of work organization will continue to grow in the future. The past formal relationships between workers and employers will continue to unravel, undermining the unemployment

insurance and social security systems and basic worker protections that have evolved in the nation over the last century. These adverse effects on employer-worker relationships have to be taken into account in any benefit-cost calculus of the impacts of new immigration. Advocates of guestworker programs have been derelict in addressing these key economic concerns.