That goes for the surveillance of communications, too, even though that method is especially contentious because the Constitution's Fourth Amendment protects Americans from warrantless government eavesdropping. But press accounts of the many programs Mr. Snowden exposed have tended to gloss over the simple truth that, except in limited circumstances, the U.S. Constitution does not apply globally. Foreigners, whether Russians, Iranians, or (even) Germans, are not afforded the same privacy rights as Americans. Nor should they be. Threats can lurk anywhere, from Crimea, to Natanz, Iran to Hamburg, where several 9/11 hijackers plotted. And no foreign intelligence service affords privacy rights to Americans.