Holocaust denial is an antisemitic conspiracy theory that asserts that the Nazi genocide of Jews, known as the Holocaust, is a fabrication or exaggeration. Holocaust denial includes making one or more of the following false claims:Nazi Germany's "Final Solution" was aimed only at deporting Jews from the territory of the Third Reich and did not include their extermination. Nazi authorities did not use extermination camps and gas chambers for the mass murder of Jews. The actual number of Jews murdered is significantly lower than the accepted figure of approximately six million. The Holocaust is a hoax perpetrated by the Allies, Jews, or the Soviet Union.

Zyklon B was the trade name of a cyanide-based pesticide invented in Germany in the early 1920s. It consists of hydrogen cyanide, as well as a cautionary eye irritant and one of several adsorbents such as diatomaceous earth. The product is notorious for its use by Nazi Germany during the Holocaust to murder approximately 1.1 million people in gas chambers installed at Auschwitz-Birkenau, Majdanek, and other extermination camps.