The present article searchs to analyze the shocks generated inside of the process of formation and transformation of the collective memories, in special in the case of the memory of the victims and survivors of World War II, particularly with the Holocaust (Shoah). It also seeks to understand how to give the formation of teses that affirm the inexistence of the Holocaust and the existence of a presumption jewish plot of world-wide domination, that is, the negacionist phenomenon and the consequences of this pratical in Brazil, as well as the efforts of diverse professional categories in safeguarding the memory and the historical discipline of the threats of intolerantes and discriminatory fakes.