"To my knowledge, it was only publically proven that the Russians use these tactics, but the US?" I've always found it more likely that if any country has been

"To my knowledge, it was only publically proven that the Russians use these tactics, but the US?" I've always found it more likely that if any country has been proven to be using these tactics, then Occam's razor states that they all are (if they can afford to). Intelligence agencies may be answerable to governments in theory, but human nature (as well as game theory) show that lack of independent oversight leads to manipulation of the rules. Doesn't matter what country you come from, if you can get away with something with little risk of detection, let alone retribution, you do. This is why laws exist, and why it's inexcusable that any sector of any government should be immune to them.