The Foreign Intelligence Surveillance Act of 1978 (FISA), was a Congressional response to a series of complaints about a governmental abuse of power in the use of electronic surveillance in prejudices to the privacy rights of the U. S. citizens. The Article II (a) of the U. S. Constitution is giving to the Executive branch (specifically to The President of USA) an inherent authority to conduct warrantless electronic surveillance for non-criminal national security purposes. However, this consention began to change in the early ’70s.
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