Armenian genocide denial
In 1990, psychologist Robert Jay Lifton got a letter from the Turkish Ambassador to the United States. In the letter, the Ambassador asked Lifton how he could have talked about the Armenian Genocide in one of his books (because the Ambassador believed the Genocide never happened).  By mistake, the Ambassador also included a draft of a letter written by scholar Heath Lowry, which told him how to keep the Armenian Genocide from being talked about in books.  Lowry was later named to a chair (an important position) at Princeton University.  Princeton had been given a $750,000 grant from the Republic of Turkey.  This led to many arguments about ethics in scholarship.