In mid-May, Edward Snowden, an American in his late twenties, walked through the onyx entrance of the Mira Hotel on Nathan Road in Hong Kong and checked in. He was pulling a small black travel bag and had a number of laptop cases draped over his shoulders. Inside those cases were four computers packed with some of his country’s most closely held secrets.

Within days of Snowden’s documents appearing in The Guardian and The Washington Post, revealing several of the National Security Agency’s extensive domestic surveillance programs, bookstores reported a sudden spike in the sales of George Orwell’s classic dystopian novel 1984. On Amazon.com, the book made the “Movers & Shakers” list and skyrocketed 6,021 percent in a single day. Written sixty-five years ago, it described a fictitious totalitarian society where a shadowy leader known as “Big Brother” controls his population through invasive surveillance. “The telescreens,” Orwell wrote, “have hidden microphones and cameras. These devices, alongside informers, permit the Thought Police to spy upon everyone….”

Today, as the Snowden documents make clear, it is the NSA that keeps track of phone calls, monitors communications, and analyzes people’s thoughts through data mining of Google searches and other online activity. “Any sound that Winston made, above the level of a very low whisper, would be picked up by it,” Orwell wrote about his protagonist, Winston Smith.

There was of course no way of knowing whether you were being watched at any given moment. How often, or on what system, the Thought Police plugged in on any individual wire was guesswork. It was even conceivable that they watched everybody all the time. But at any rate they could plug in your wire whenever they wanted to. You had to live—did live, from habit that became instinct—in the assumption that every sound you made was overheard, and, except in darkness, every movement scrutinized.

Of course the US is not a totalitarian society, and no equivalent of Big Brother runs it, as the widespread reporting of Snowden’s information shows. We know little about what uses the NSA makes of most information available to it—it claims to have exposed a number of terrorist plots—and it has yet to be shown what effects its activities may have on the lives of most American citizens. Congressional committees and a special federal court are charged with overseeing its work, although they are committed to secrecy, and the court can hear appeals only from the government.

Still, the US intelligence agencies also seem to have adopted Orwell’s idea of doublethink—“to be conscious of complete truthfulness,” he wrote, “while telling carefully constructed lies.” For example, James Clapper, the director of national intelligence, was asked at a Senate hearing in March whether “the NSA collect[s] any type of data at all on millions or hundreds of millions of Americans.” Clapper’s answer:…