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Speaking publicly about the role of Iran in Afghanistan--which is substantial, and about which we have considerable information--seems to be taboo for our current leaders. This is neither new nor surprising. Iranians, and Iranian-trained terrorists from organizations such as Hezbollah, have been killing Americans for years. The Bush administration, for example, had similar information about Iran's role in both Iraq and Afghanistan, and top officials did their best to suppress it. According to reporter Bob Woodward, a top State Department official knew that Iran had committed "acts of war" against our troops in Iraq and kept that information from the president, fearing a forceful response.