While it's arguable that Berlusconi was a sensible target...How does that justify spying on the United Nations High Commissioner for Refugees (UNHCR) in Afghanistan? Or from previous revelations, UNICEF - the children's agency? FWIW, I've just started laying out one aspect of this debate and how intelligence operation blowback can affect the perception of neutrality of NGOs working on the ground. This increasingly se…
Corruption. Obviously we're both speculating here, but accountability is a serious problem with NGOs, along with corruption/graft/general-wastefulness. So if the US suspected massive (tens of millions of dollars, or more) corruption, that's a plausible reason. I'm not saying it's likely, just that there are possible reasons out there in the world.
Essentially, they seem to be looking out for 'dissidents' - the same sort of behaviour that US politicians often berate when other countries, such as India or China, do it (also wrongly!).