Over ten million undocumented immigrants reside in the United States, living and working outside the law. Hiding from the authorities, they operate in the shadows of the economy. The Senate recently passed legislation that would provide millions of illegal immigrants with legal guest-worker status in order to bring them into the mainstream of American life and make them accountable to the law. The Senate bill, however, requires that any business hiring guest workers pay them "prevailing wages" set well above market rates.