Movies where the villain's right-hand man turns out to be the actual villain

I'm watching Batman Begins, and Liam Neeson plays "Ducard", the supposed assistant to Ra's al Ghul. But it of course turns out later that Neeson's character is the real Ra's al Ghul, and Ken Watanabe is just a decoy figurehead.It makes me remember Fast & Furious (the fourth film), where John Ortiz's character "Campos" is supposedly the deal man for the villain Braga ... but in fact turns out to be Braga himself, using decoys to "hide in plain sight".Are there other movies that use this device? It feels sort of obvious/cliche, and I'm sure I've seen some others, but they don't come to mind. via /r/movies https://ift.tt/a05pMRh