In one of his last acts as director of central intelligence, Helms ordered all MK-ULTRA records destroyed. The chief of the CIA Records Center in Warrenton, Virginia, was alarmed. He called [Sidney] Gottlieb and asked for confirmation. Gottlieb took the matter seriously enough to drive to the Records Center, present the order in person, and insist that it be carried out forthwith. On January 30, 1973, seven boxes of documents were shredded.
“Over my stated objections, the MK-ULTRA files were destroyed by order of the DCI (Mr. Helms) shortly before his departure from office,” the chief of the Records Center wrote in a memo for his file.
Around the same time, Gottlieb directed his secretary to open his office safe, remove files marked “MK-ULTRA” or “Secret Sensitive,” and destroy them. She did as she was told. Later she said she had made no record of what she destroyed and “never thought for a moment to question my instructions.” With these blows, a historic archive was lost.
The only reason it came to light at all as anything more than a rumor, is that they hadn't been diligent enough in destroying all (then physical) files:
Senators also believed they were finished with MK-ULTRA. Nearly two years had passed since “Joseph Scheider” testified about it in secret. With documents destroyed and the few people who knew the truth resolved to stay silent, the case had gone cold.
A sudden discovery reopened it. In 1977 the newly installed director of central intelligence, Stansfield Turner, whom President Jimmy Carter had appointed with a mandate to bring transparency to the CIA, received a Freedom of Information Act request for any MK-ULTRA files that might have escaped destruction. He passed it on to an archivist and encouraged him to make a thorough search. The archivist, as Turner later put it, “did a very diligent job of Sherlock Holmesing.” In a depot where CIA financial records were stored, he found a collection of MK-ULTRA expense reports. Among them were references to various “subprojects.” The Washington-based researcher whose FOIA request had led to the discovery, John Marks, released a batch of the documents at a press conference.
“Central Intelligence Agency documents released yesterday revealed new details of experiments on unsuspecting citizens designed to control their behavior through exotic drugs, electroshock, radiation and other means,” the Washington Post reported. “More than 1,000 pages of documents obtained from the Agency under the Freedom of Information Act provided the details on the super-secret project, code-named MK-ULTRA.”
This is from Stephen Kinzer's excellent book on MK Ultra: Poisoner In Chief. It details a lot of deep state crimes. It has received positive coverage in some mainstream media outlets, in case someone shouts "CONSPIRACY THEORIST" at you.
Unfortunately, MK Ultra was not that. People were killed, driven mad and driven to suicide with this program. They helped some Nazi and Japanese 'doctors' performing revolting "experiments" on people to get free so they could come work for the deep state.
Some of these victims were American prisoners of war.
What happened to the guy responsible for this? His name was Ishii.
This is from the same book.