Mahmoud Abass (Abu Mazen) is a holocaust denier.
"Abbas wrote a doctoral dissertation, referring to well-known Holocaust deniers, claiming secret ties between the Nazis and the Zionist movement."
"His doctoral thesis later became a book, The Other Side: the Secret Relationship Between Nazism and Zionism, which, following his appointment as Palestinian Prime Minister in 2003, was heavily criticized by some Jewish groups as an example of Holocaust denial. In his book, Abbas raised doubts that gas chambers were used for the extermination of Jews, and suggested that the number of Jews murdered in the Holocaust was "less than a million.""
http://en.wikipedia.org/wiki/Mahmoud_Abbas