If you mean other than the main six or seven groups that are always mentioned; young people who listened to American music, people who supported him before he went to prison, but no longer agreed with him, paedophiles, habitual criminals to name some.
Please see the related question.
he believed that they were a lower class of being
The refugees in Hitler's time and those immigrants groups from other places did not have many similarities aside from the fact that food and shelter was difficult to come by. For Hitler's camps, the obvious difference was the torture the refugees received.
Hitler!
they included jehovas witnesses, communists, jews,homosexuals, and gypsies. also, his primary target was gypsies.
Hitler primarily targeted Jews, whom he blamed for Germany's social and economic problems. The Nazi regime implemented systematic persecution, leading to the Holocaust, where approximately six million Jews were murdered. In addition to Jews, Hitler also targeted other groups, including Romani people, disabled individuals, communists, homosexuals, and political dissidents, but the scale and intensity of the anti-Jewish campaign were unparalleled.
the list of groups who were not targets would go on for pages, it is easier to list who was a target:
He was involved with Hitler so he for sure targeted Jews. There are probably more but that is the only one I know.
Because they were scared of Hitler and the Nazi party
There were many other groups that had people killed by Hitler and the Nazis, but the Holocaust was the specific actions against the Jews, therefore there were no other groups killed in the Holocaust. The only other group which suffered similar persecution to the Jews was the gypsies.
Jews (and Gypsies)
To stop Hitler and help stop the Jew's persecution