I'm honestly not convinced that this was part of MK-ULTRA, there's no hard evidence and what I think people don't really appreciate is that Psychologists (especially around this time) were performing "studies" where they basically just tortured people. For example, the Stanford Prison "Experiment"
"Anyone who is a conspiracy theorist has clearly never been a project manager. It's impossible to get a dozen people to do the right thing, much less keep it a secret."
If the CIAs most secret illicit experiment came to light, what makes you think they are meaningfully hiding more?
IIRC it came to light when documents that were supposed to be shredded were declassified by mistake. The government has shown that it's actually really good at keeping secrets, or at least keeping things quiet. Elsewhere in this thread there's the discussion of a possible FBI program to get people to commit mass shootings that's widely considered to be a crazy conspiracy theory despite there being individual documented examples ie https://www.cnn.com/2017/11/29/politics/aby-rayyan-fbi-terro...
My whole thing with MK-ULTRA and Ted is that researchers were happy to do stuff as damaging and way less (potentially) useful than his experiment.
It came to light because some financial records were sent to the CIA's Retired Records Center for some reason and escaped destruction. See page 5 of [1].
Let's say I work on a project where we keep Elvis alive in a super secret bunker in antarctica. What can I do? Call the cnn and tell them? Make a post on 4chan? Make such a claim here? Look, I'm leaking top secret info, and nothing will happen. Until CIA officially admits keeping Elvis there, noone will believe me... (except a few conspiracy theorists, branded as nutjobs by the general public).