Men in Black ?
Robert Hunter (grateful Dead previously called THE WARLOCKS)
was a CIA operative.

==================================

During the early period of the Cold War, the CIA became convinced that communists had discovered a drug or technique that would allow them to control human minds. In response, the CIA began its own secret program, called MK-ULTRA, to search for a mind control drug that could be weaponized against enemies.

MK-ULTRA, which operated from the 1950s until the early '60s, was created and run by a chemist named Sidney Gottlieb. Journalist Stephen Kinzer, who spent several years investigating the program, calls the operation the "most sustained search in history for techniques of mind control."

Some of Gottlieb's experiments were covertly funded at universities and research centers, Kinzer says, while others were conducted in American prisons and in detention centers in Japan, Germany and the Philippines. Many of his unwitting subjects endured psychological torture ranging from electroshock to high doses of LSD, according to Kinzer's research.
[link to www.npr.org (secure)]