It would be highly informative to know what Foucault would have said over the past few years as the United States has increased its tendency to spy on its citizens - and those of other nations. Foucault knew that each knew generation creates new reasons, new justifications for pan-optical surveillance. "Homeland security" - with its faintly fascist suggestion of word choice - is merely one more reason that those with power in a society use to make a spectacle of those who do not have power. The world has since the Industrial Revolution - Foucault argues - been increasingly divided between the watchers and the watched, with the number who are watched growing ever greater and the watchers growing both more powerful and more skilled.
Foucault, Michel. Discipline & Punish : The Birth of the Prison. New York: Vintage, 1995.