Adolf Eichmann
During the Holocaust the mass deportations of the Jewish people was headed by Adolf Eichmann. He was "responsible for keeping the trains rolling into the death camps." Before he became such a hated official in Nazi Germany, he learned how to live like a Jew. Hitler asked him to deeply study Jews, so it would be easier to transport them and they would pose less resistance. He used this over-abundance of knowledge to create a very effective system to transport and kill the Jewish people. Eichmann created two "Jewish Emigration Centers" which were just a cover-up for mass deportation centers. All in all this man was responsible for the deaths of over 1.5 millions Jews that he had sent to concentration camps.