-Warantless surveillance of US citizens (this is bad whether it's by law enforcement, intelligence agencies, or anyone).
-Infiltration of foreign companies in allied or neutral nations purely for economic or geopolitical insight, not for military purposes (Brazil's Petrobras oil company, all sorts of spying in Germany and Norway and other places).
Personally I'm all for the kind of operations they're conducting in Iran and China, as these countries have been doing the same to us and to others for a long time. But they've become far too greedy in their desire for information domination and power, to the point where there is clearly no line that shouldn't be crossed. To them, if anything anywhere in the world is open for exploitation or surveillance, then they feel like they have a right to use it.