Fermi was a native of Mussolinis Italy. but during World War II he spearheaded the Manhattan project that enabled the United States to become the first Nation to develop atomic weapons. One shudders to think of the implications of denying Fermi. or Werner von Braun. access to our best facilities because they born in nations which were unfriendly to us at a particular point in history. The Government should guard against KGB agents masquerading as students to get at our supercomputers. through visa controls. but a blanket prohibition based on birthplace would be a crude and foolhardy solution. The Pentagons plan also wouldnt solve the problem. The most vulnerable supercomputers are those in the private sector.