Let's not forget perhaps their most famous alumnus, Ted Kaczynski aka the Unabomber [1]. It's not clear whether or not they dosed him with psychedelics, but the records of the research done to him were sealed [2], so we only know for sure that they inflicted significant psychological trauma on him.
[1] https://www.theatlantic.com/magazine/archive/2000/06/harvard...
[2] https://www.thecrimson.com/article/2000/7/14/murray-center-s...