The Congress has received lots of free advice lately from Mexican government officials and illegal aliens waving Mexico's flag in mass demonstrations coast-to-coast. Most of it takes the form of bitter complaints about our actual or prospective treatment of immigrants from that country who have gotten into this one illegally — or who aspire to do so. If you think these critics are mad about US immigration policy now, imagine how upset they would be if we adopted an approach far more radical than the bill they rail against which was adopted last year by the House of Representatives —...