American laws make this country the freest in the world -- which is precisely what attracts foreign militants to come here. The FBI labors under serious restrictions that prevents it -- unless there is evidence of specific criminality -- from monitoring groups who advocate violence or other extremist policies. These groups know about the FBI's limitations and take advantage of them. They also take advantage of the fact that they are nearly impervious to infiltration by the authorities, speaking foreign languages and living in a different cultural universe. Living here benefits them in other ways too: modern technology makes it possible for them to spread ideas via faxes and the Internet all over the world, and instantly to transfer monies and give instructions.