Some Anons talked about it earlier (see notables this day): ELF was mentioned in the documentary that Q posted.
It was in correlation with M. Aquino, who wrote a paper mentioning it.
The paper is cited in the documentary and easy to find on the web:
https://www.wanttoknow.info/mk/mindwar-michael-aquino.pdf
But the story is alot bigger here. Aquino wrote a three part book series out of that (you can ofc all buy em on amazon, hello mr. bezos). Here are the relevant pages from the first book of that series (also called "Mind War"), the excerpts are just after the MK-Ultra chapter.