The leader of Al Qaeda was a major terrorist threat for decades. He was the mastermind behind the 9/11 attacks on the US. Fortunately he was killed on May 1, 2011 by US troops in Pakistan.
It depends on your opinion. Adolf Hitler caused many more deaths and discriminated against Jew's where as Osama bin laden gave away plans of the world trade centre to a group of terrorists which he...
Hitler did far more harm than anything bin Laden has done so far, so on that basis Hitler would have to be judged the winner of the contest for most evil person. Since bin Laden is (as far as we...