Or more modern, Exxon. I don't have such a problem with doing this kind of stuff in europe for Oracle, or uselessly for boeing (airbus will always get better treatment in europe). But you want to see some real cloak and dagger shit, read about commodities.
I read about it in a book by an ex-CIA guy from the Clinton years. Can't remember the guy's name now, but remember thinking at the time (2004 or so) that it had almost certainly gotten worse since then. His allegations were that State and CIA were frequently involved in securing access to oil in the 3rd world for American corporations, because it was deemed a national security priority.
Not sure if this is the book but Confessions of an Economic Hitman details how this process evolved since the 70s into the full-blow economic warfare we (our reps, leaders, and big corps) practice today.
http://en.wikipedia.org/wiki/United_Fruit_Company