Also investing money in the Third Reich, legally, to support fascism and a “pure” society in Europe. Although many investors turned their backs on the Nazis when America entered the war, several companies continued to support the war effort and the Holocaust by building war machines and using slave labor to do such things. Vital resources and the methods of obtaining them were also provided to the Nazis by American companies; resources such as ethyl fuel, synthetic rubber (buna), and synthetic fuel. No one played a more direct role in one of history's most effective genocides than IBM, which provided the Nazis with the technology and methods to store and process all the data necessary for the identification and extermination of Jews and other peoples.