For many years the attorney general could authorize surveillance of foreign powers and agents of foreign powers without any court review, but in 1978 Congress passed the which provided for court oversight of foreign surveillance.

Foreign Intelligence Surveillance Act.

Explanation:

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Foreign Intelligence Surveillance Act of 1978 is an American law that regulated the surveillance procedures of foreign entities and persons residing in the USA and who are suspected of carrying out espionage or terrorism actions.

This law authorized non-judicial surveillance of foreign entities and individuals  for up to one year. If in the event that surveillance was involved an American person, a court order was required within a period of less than 72 hours.

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