control http://www.pbs.org/kpbs/theborder/hi...-timeline.html http://en.wikipedia.org/wiki/Operation_Wetback Operation Wetback was a 1954 operation by the United States Immigration and Naturalization Service ( INS ) to remove about one million illegal immigrants from the southwestern United States , focusing on Mexican nationals [1] . [ edit ] History Burgeoning numbers of illegal Mexican immigrants prompted President Dwight