sentences:  Christophersen insisted that, staying in the area, he would have been certain to identify mass killings and claimed that he never witnessed or made aware of any such incidents.Christophersen, who was initially a member of the CDU party, then German Party and briefly a member of Germany's Neo-Nazi NPD party, forged close contacts, both domestically and internationally, with other proponents of the "Auschwitz lie" such as Stäglich, Roeder, Udo Walendy, Robert Faurisson and Florentine Rost van Tonningen, and with "Stille Hilfe" ("Silent Help"), an organisation assisting neo-Nazi activists.Christophersen appeared as a witness in the trial of Ernst Zündel in Canada.