The “Final Solution” was the Nazi policy to exterminate millions of Jews, and Heinrich Himmler and Adolf Eichmann first introduced this policy. This resulted in the murder of millions of Jews in concentration camps between the years 1941 and 1945. During the spring months and then throughout the summer in the year 1940 the German army started to expand Hitlers empire located in Europe, by taking over and conquering the countries of Denmark, Norway, the Netherlands, Belgium, Luxembourg, and France. Then beginning in the year of 1941 the Jew and European Gypsies from all over were transported to the ghettoes in Poland. The Germans attacked the Soviet Union in June 1941, after the attack there was a new and high level of brutality in warfare, and there were mobile killing units used which were called Einsatzgruppen, this unit killed over hundreds of thousands of Soviet Jews. A memorandum which was dated July 31, 1941, which was from Hitlers top commander Hermann Goering to Reinhard Heydrich, who was the chief of the security service. The memorandum referred to the need for a “final solution” to the Jewish Question. And that is exactly what they got, a policy to kill of millions. In the fall of 1941 every person who was Jewish and was being held in German territory had to be marked with a yellow star, this star was what made them stand out as an open target. Thousands with the yellow star were then transported to ghettoes in Poland. Since the year 1941, when the mass killing methods were put into action, because of the Final Solution policy. Millions were gassed with pesticide Zyklon-B. And another order of the pesticide was placed for the Holocaust “Final Solution” destruction to come.