Most of you are quite familiar with this, so we are not going to go into it, but chapter 3 deals with Haman. Haman was a type of Hitler. He was a descendant of the Amalekites who hated the Jews, probably through the back door politicking and all those things that go on by those striving to put themselves in front of the pack in this world to serve themselves. He got himself appointed chief minister to the king.
In spite of his hatred for Mordecai personally, Haman saw this as an opportunity to wipe out all the Jews, manipulating the capricious King Ahasuerus.
Haman had risen to power, being promoted by King Ahasuerus to what appears to be second only to the king. And it was commanded by the king that when Haman passed by that everyone was to bow and pay homage. Now, despite of all those around Mordecai urging him to give in and pay and bow to Haman, he refused. And after Haman saw it, he was furious. Thus, in his hatred, he began to plot to eliminate not only Mordecai, but all the Jews living throughout the provinces.