Executive Order 12333, signed on December 4, 1981 by U.S. President Ronald Reagan, was an Executive Order intended to extend powers and responsibilities of U.S. intelligence agencies and direct the leaders of U.S. federal agencies to co-operate fully with CIA requests for information. This executive order was entitled United States Intelligence Activities.

Raw SIGINT Guideines (pic related):

https://www.dni.gov/files/documents/icotr/RawSIGINTGuidelines-as-approved-redacted.pdf