Adolf Hitler deemed Jews and other Holocaust targets as Untermenschen ( `` sub-humans `` ) and socially undesirable .
Under Hitler 's leadership and racially motivated ideology , the Nazi regime was responsible for the genocide of at least 5.5 million Jews and millions of other victims whom he and his followers deemed Untermenschen -LRB- `` sub-humans `` -RRB- and socially undesirable .
Adolf Hitler