The movement of Mexican laborers across the international boundary into the southwestern United States has been occurring since the establishment of a boundary in that area. It is a natural movement of worker toward the source of work. Interests of the governments involved have caused checks to be placed upon this movement of workers. Public Law 78 represented one of the recent attempts of the United States government, through co-operation with the Mexican government, to regulate the movement of migrant workers.In this article I will briefly trace the history of PL 78. The impact of this law upon Mexico and its relevance for United States relations with that country are of importance.
