Project MKULTRA/Subproject 4

Subproject 4 was a U.S. Central Intelligence Agency program, operating under the aegis of Project MKULTRA, "dealing with the application of the magician's art to covert activities such as the delivery of various materials to unwitting subjects," in particular funding the production of a manual by John Mulholland, an American stage magician. This was followed-up with supplementary material through Subproject 15 and Subproject 19.