Question: The Jonestown conspiracy theories are often believed by proponents to be a covert example of a program of experiments on human subjects that was at times what?
Sentence (from "Project MKUltra"): Project MKUltra, also called the CIA's mind control program, is the code name given to a program of experiments on human subjects, at times illegal, designed and undertaken by the United States Central Intelligence Agency.
Relevant evidence: Yes