Mahler was involved in founding the Society for the Rehabilitation of Those persecuted for Refutation of the Holocaust (Verein zur Rehabilitierung der wegen Bestreitens des Holocaust Verfolgten, VRBHV) on 9 November 2003 [REF].
On 23 November 2007 the Amtsgericht in Cottbus sentenced Mahler to six months' imprisonment without parole for having given a Hitler salute when reporting to prison for a nine-month term the previous year.