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Have you ever thought that you find yourself in a similar situation. When employment is difficult to know what is in her team.
Try "the iron mask". The main goal is to bring you to the emotions. So do not succumb to provocations.
Be around professional. Well you know your business. It's possible to screw you over. Lead your report to commit all their actions on the work. If suddenly there is a conflict, the plan will play in your favor. Submit to his leadership, and the truth is on your side.
Hand on the pulse. Make friends from another Department, and even better of the chiefs. Always watch what is happening around you.
Calculate guilty of all the conspiracies. Talk to that person heart to heart, ask for help from him. Your insolence disarm the enemy. This often works.