text: Many aliens who became lawful permanent residents as Special Agricultural Workers ( SAW ) do not have the resources to bring their entire families to the United States , so these aliens also continue to come to the U.S. as single workers and return to Mexico during periods of unemployment .
  
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  A lot of aliens who are permanent residents as SAW don 't have money enough to bring their families to the United states , so they are forced to travel back and forth .