Here is one...
https://www.nytimes.com/2021/10/05/us/politics/cia-informants-killed-captured.html
Top American counterintelligence officials warned every C.I.A. station and base around the world last week about troubling numbers of informants recruited from other countries to spy for the United States being captured or killed, people familiar with the matter said.
According to reporting I heard, the 2021 alert was prompted by an uptick in losses...