For fifteen years, every time that I heard of a witness anywhere, no matter where in the portion of Europe that was not occupied by the Soviets, who claimed to have himself been present at gas exterminations, I immediately went to him to get his testimony. And, each time the experience ended in the same way. With documentation in hand, I would ask him so many precise and detailed questions that soon it became apparent that he could not answer except by lying. Often his lies became so transparent, even to himself, that he ended his testimony by declaring that he had not seen it himself, but that one of his good friends, who had died in the camps and whose good faith he could not doubt, had told him about it. I covered thousands and thousands of kilometers throughout Europe in this way.

Paul Rassinier (French author) “The Lie of Ulysses: A Glance at the Literature of Concentration Camp Inmates”, 1978 (Rassinier was a member of the French resistance who survived Buchenwald. He has been called “the father of Holocaust denial”)