Who was the German executor of the Jews?
The main organisation involved in mass murder of Jews and others
that the National Socialists wanted to annihilate, was the SS
(Schutzstaffeln), and they managed the death camps with help of
Kapos e.g.
Their leader was Heinrich Himmler, thus directly responsible
under Hitler himself.
He had appointed Reinhard Heydrich to lead the execution of the
"final solution", according to a plan he presented at the Wannsee
conference 1942.