Holocaust denial is the act of denying the genocide of Jews in the Holocaust during World War II. Deniers claim, despite the wealth of eyewitness testimony and the vast amout of documentary evidence to the contrary, that the Nazis did not murder six million Jews and the notion of homicidal gas chambers is a myth. Many deniers say that Jews made up the Holocaust and Ann Frank's diary was faked.
There are several problems with attempting to deny the Holocaust. Many Nazi leaders who were brought to court at the end of the war confessed the killing of Jews in concentration camps. Nazi Otto Ohlendorf admitted that between June 1941 and 1942 he and his men between killed 90,000 Jews. Some Holocaust deniers falsely claim that there are no documents or papers confirming the Jewish genocide, and some say that Hitler wanted to help Jews and liked them. None of this is true. Hitler himself said that if war broke out, he would bring about a Jewish genocide in Europe.
Denying that the Holocaust took place is a crime in several Europen countries.