He was a Nazi collaborator and during WW2
On 1 March 1944, while speaking on Radio Berlin, al-Husseini said: 'Arabs, rise as one man and fight for your sacred rights. Kill the Jews wherever you find them. This pleases God, history, and religion. This saves your honor. God is with you.
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http://en.wikipedia.org/wiki/Haj_Amin_al-Husseini
Image Source:Bundesarchiv Bild 146-1987-004-09A, Amin al Husseini und Adolf Hitler