Hungary marks 70 years since Roma genocide Hungarians marched on Saturday to mark the 70th anniversary of the mass killing of Roma by the Nazis in World War II. The memorial was held on the anniversar of one of the worst mass killings of Roma, when nearly 3,000, many of them children, were taken to the gas chambers at Auschwitz on the night of August 2, 1944. IMAGES AND SOUNDBITES.