Congressional report on the SOA: https://www.policyarchive.org/download/1033
SOA training manual: https://ia902708.us.archive.org/16/items/USArmySchooloftheAmericasTrainingManuals/US Army School of the Americas Training Manuals_text.pdf
Documentary: https://www.youtube.com/watch?v=GUtumGk0E6Q
https://jacobin.com/2019/11/shut-down-school-of-the-americas-whinsec-ice-border-patrol
A while back I picked up this book at the library. I turned to the back and coincidentally, Michael Parenti was quoted and he recommends the book.