MKULTRA's work in collaboration with a McGill researcher, in which they put psychiatry patients into a coma against their consents and tortured them : https://en.m.wikipedia.org/wiki/Montreal_experiments
https://www.youtube.com/watch?v=N_PXI5Ba1Ak
Not sure how true it all is.
https://www.cbc.ca/archives/topic/the-duplessis-orphans
What I've read so far is horrible :(
That said, yes we do actually know about the MKULTRA Montreal Programme, because of testimonies. We just don't know what more there was, and there is certainly more.