According to Jewish tradition, Haman wanted to murder every single Jew and made preparations to achieve just that. This was even more heinous than Hitler's view where he "only" wanted to murder every Jew in the territories he controlled. If the Jews are allowed to have great revulsion towards Hitler, how much more should they have for a person who actually attempted to remove them entirely from history.
With a few exceptions such as Hitler and Haman, it is impossible to answer categorically.
Haman was the 'Jews enemy'
Purim
God turned Haman's plot around by using Esther's courage and influence to expose Haman's sinister plan to the king. Through Esther's intervention, the king learned of Haman's plot to exterminate the Jewish people and instead, Haman faced the punishment he had intended for the Jews. God worked behind the scenes to protect His people and bring about justice in the situation.
Esther.
From the gallows he had built to kill the Jews.
Haman.
A lot if stuff. But the main part is that haman plans to kill th Jews in Persia but then mordekai and ester find out, tell the king, and then haman is killed on the day he planned to kill the Jews.
Purim
That would be Haman in the book of Esther.
Purim
Haman was a megalomaniac who wanted everyone to bow down to him. He was infuriated when Mordecai refused to do so (Esther ch.3).