Operation CHAOS or Operation MHCHAOS was a Central Intelligence Agency (CIA) domestic espionage project targeting American citizens operating from 1967 to 1974, established by President Lyndon B. Johnson and expanded under President Richard Nixon, whose mission was to uncover possible foreign influence on domestic race, anti-war, and other protest movements. The operation was launched under Director of Central Intelligence (DCI) Richard Helms by chief of counter-intelligence James Jesus Angleton, and headed by Richard Ober. The "MH" designation is to signify the program had a global area of operations.

MYSTIC is a former secret program used since 2009 by the US National Security Agency (NSA) to collect the metadata as well as the content of phone calls from several countries. The program was first revealed in March 2014, based upon documents leaked by Edward Snowden.

Operation Midnight Climax was an operation initially established by Sidney Gottlieb and placed under the direction of Federal Narcotics Bureau in Boston, Massachusetts with the officer George Hunter White under the pseudonym of Morgan Hall for the CIA as a sub-project of Project MKULTRA, the CIA mind-control research program that began in the 1950s. Before the programs were shut down, hundreds of scientists would work on them.

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