One of the great staples of the modern Washington movie is the dark and ruthless corporation whose power extends into every cranny around the globe, whose technological expertise is without peer, whose secrets are unfathomable, whose riches defy calculation, and whose network of allies, in and out of government, is held together by webs of money, ambition, and fear. You’ve seen this movie a dozen times. Men in black coats step from limousines on wintry days and refer guardedly to unspeakable things. Surveillance cameras and eavesdropping devices are everywhere. Data scrolls across the movie screen in digital fonts. Computer keyboards clack softly. Seemingly honorable people at the summit of power—Cabinet secretaries, war heroes, presidents—turn out to be pathetic pawns of forces greater than anyone can imagine. And at the pinnacle of this dark and ruthless corporation is a relentless and well-tailored titan—omniscient, ironic, merciless—played by someone like Christopher Walken or Jon Voight.

To be sure, there isn’t really such a corporation: the Omnivore Group, as it might be called. But if there were such a company—and, mind you, there isn’t—it might look a lot like the largest government contractor you’ve never heard of: a company known simply by the nondescript initials SAIC (for Science Applications International Corporation), initials that are always spoken letter by letter rather than formed into a pronounceable acronym. SAIC maintains its headquarters in San Diego, but its center of gravity is in Washington, D.C. With a workforce of 44,000, it is the size of a full-fledged government agency—in fact, it is larger than the departments of Labor, Energy, and Housing and Urban Development combined. Its anonymous glass-and-steel Washington office—a gleaming corporate box like any other—lies in northern Virginia, not far from the headquarters of the C.I.A., whose byways it knows quite well. (More than half of SAIC’s employees have security clearances.) SAIC has been awarded more individual government contracts than any other private company in America. The contracts number not in the dozens or scores or hundreds but in the thousands: SAIC currently holds some 9,000 active federal contracts in all. More than a hundred of them are worth upwards of $10 million apiece. Two of them are worth more than $1 billion. The company’s annual revenues, almost all of which come from the federal government, approached $8 billion in the 2006 fiscal year, and they are continuing to climb. SAIC’s goal is to reach as much as $12 billion in revenues by 2008. As for the financial yardstick that really gets Wall Street’s attention—profitability—SAIC beats the S&P 500 average. Last year ExxonMobil, the world’s largest oil company, posted a return on revenue of 11 percent. For SAIC the figure was 11.9 percent. If “contract backlog” is any measure—that is, contracts negotiated and pending—the future seems assured. The backlog stands at $13.6 billion. That’s one and a half times more than the backlog at KBR Inc., a subsidiary of the far better known government contractor once run by Vice President Dick Cheney, the Halliburton Company.

It is a simple fact of life these days that, owing to a deliberate decision to downsize government, Washington can operate only by paying private companies to perform a wide range of functions. To get some idea of the scale: contractors absorb the taxes paid by everyone in America with incomes under $100,000. In other words, more than 90 percent of all taxpayers might as well remit everything they owe directly to SAIC or some other contractor rather than to the IRS. In Washington these companies go by the generic name “body shops”—they supply flesh-and-blood human beings to do the specialized work that government agencies no longer can. Often they do this work outside the public eye, and with little official oversight—even if it involves the most sensitive matters of national security. The Founding Fathers may have argued eloquently for a government of laws, not of men, but what we’ve got instead is a government of body shops.

The unhappy business practices of the past few years in Iraq—cost overruns, incompetence, and corruption on a pharaonic scale—have made the American public keenly aware of the activities of mega-contractors such as Halliburton and Bechtel. Although SAIC takes on government projects such as those pursued by contractors like these, it does not belong in exactly the same category. Halliburton and Bechtel supply the government’s brawn. They pour concrete, roll out concertina wire, build infrastructure. They call on bullnecked men to provide protection.