The collection includes over 1,200 documents detailing experiments with drugs, hypnosis and other mind control techniques.
The MKUltra program, launched during the Cold War, continues to be a controversial chapter in U.S. intelligence history.
Rep. Anna Paulina Luna (R-FL) announced on Wednesday that the House will hold a hearing on a Cold War-era CIA program in May.
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A CIA 'dirty secret' facing scrutiny, investigative journalist says
MK-Ultra was a reaction to communist adversaries using brainwashing techniques on U.S. prisoners.
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