Guest-workers who lose jobs may be forced to leave immediately instead of being given a chance to find another job.
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http://www.nytimes.com/2004/01/09/opinion/09ABRA.html And in some respects, the dangers of a guest worker program in the United States are graver than they were in Europe. Germany, the Benelux countries, Scandinavia and other European host countries had and still have very strong labor unions. Those strong unions were able to make certain that guest workers were not used by employers to depress wages. By contrast, American labor unions are weak to nonexistent in most segments of the labor market.
In addition, President Bush has clearly expressed his intention to put employers in charge: guest workers will be selected by employers and will be able to remain in the United States only so long as they stay with the employer who brought them. This is a sure recipe not only for the exploitation of these "guests" but also for the depression of American wages generally, especially among those who can least afford it ? many of them immigrants.