Since no one was prosecuted on the basis of data stolen or retrieved by his spies, the courts rarely encountered this behavior and never had to rule on it, and thus it went largely unchecked. A few victims challenged the spying, but the Supreme Court ruled that without palpable harm, the challengers lacked the legal ability to complain in court – what judges call "standing."
But many Americans did complain to Congress, which in 1978 enacted the Foreign Intelligence Surveillance Act, commonly called FISA. FISA provided that all domestic surveillance be subject to the search warrant requirement of the Fourth Amendment, except for spying on foreign agents operating in the U.S. For those cases, FISA established a secret federal court that has been authorized to issue search warrants to spy on foreign agents.
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Over time, the requirement of status as a foreign agent was modified to status as a foreign person. This, of course, was an even lesser standard and one rarely rejected by the FISA court. In fact, that court has rarely rejected anything, having granted search warrants in well over 97 percent of applications. This is hardly harmless, as foreign persons in the U.S. are frequently talking to Americans in the U.S. Thus, not only did FISA violate the privacy rights of foreigners (the Fourth Amendment protects "people," not just Americans); it violated the rights of those with whom they were communicating, American or non-American.
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