In addition to some of Hersh's bigger breaking investigations, he wrote a lesser known article before the US-engineered "Arab Spring" called, "preparing the battlefield" where he exposed US preparations for using extremists to overthrow the Syrian government as part of a wider proxy war with Iran.
This was in 2008, predicting with extreme accuracy what and how it would unfold from 2011 onward.
https://www.newyorker.com/magazine/2008/07/07/preparing-the-battlefield