You can read about Ursala Haverbeck, a German citizen, in this old news article: http://justice4germans.com/2015/01/24/frau-ursula-haverbeck-declares-victory-we-can-now-dismiss-auschwitz/
The old news article cited above includes a statement allegedly made by Sir Hartley Shawcross. I blogged about this statement on these two previous blog posts: https://furtherglory.wordpress.com/tag/sir-hartley-shawcross/
The problem with the Jews in Germany all started with Der Dolchstoss which you can read about here: https://furtherglory.wordpress.com/2014/06/30/der-dolchstoss-and-the-road-to-the-holocaust/
Wikipedia has the following information about Ursala Haverbeck:
In November 2014 Haverbeck lodged a complaint against the Central Council of Jews. She threw the Association “persecution of innocent people” ago. The procedure was established in early December 2014 reinstated. The Bielefeld prosecutor finally considered a case against them for false accusation.
In March 2015 she again denied the Holocaust in the NDR broadcast Panorama. She described the Holocaust as a “sustainable lie in history” Her home was subsequently searched by German police to seize evidence for possible criminal charges.