Edited sentence: '  The same type of commissions which 'investigated' the massacre of 15,000 Polish officers at Katyn, duplicitously laying the blame for the mass executions on to the account of the German armed forces.Finally, why would the Soviets purposely understate the number of non-Jewish casualties at Auschwitz.Moreover, mainstream Jewish historians such as Nathan Ausubel, certainly claimed that '4 million Jews' had been exterminated at Auschwitz alone.Moreover, the testimony which is adduced in favor of 4 million Jewish deaths at Auschwitz alone preponderates in the literature of the period.On this point, refer to Ausubel's 'Pictorial History of the Jewish People,' under the heading 'Oswiecim,' which has gone through at least 17 consecutive printings.Qui bono.So again the question must be asked, 'Upon what sources 'did' the mainstream historians rely,' if not the Soviets and their 'extraordinary investigative commissions.That being said, it is necessary to enquire as to the sources upon which 'mainstream' historians have relied in reaching a consensus.The important question which must be raised is, 'How trustworthy are the 'Extraordinary Soviet Commissions' which claimed to investigate Nazi crimes in Auschwitz, Maidanek, and other camps in Eastern Europe.To that, the Wiesenthal Center offers no credible explanation.To what purpose.Unfortunately, the trustworthiness of such documents must be brought into question as the overwhelming majority of them stem from the former Soviet Union, and in particular, Soviet arch-propagandist Ilya Ehrenburg and his Soviet anti-Fascist League.Why would they, conversely, overstate the Jewish casualties