generally walls fences and guards.
Some people helped individuals during the Holocaust. Nobody tried to 'prevent the Holocaust' - even the Allies did not try to do that.
violation
Presumably you are referring to the fact that some Jews blamed the Holocaust on those Jews who were not pious enough.
some of them did the persecuting, others tried to make sure that they did not become one of the persecuted. Others lived their lives oblivious to the Holocaust.
dying
Some Quakers hid Jews, but the Quakers did not organize some swoop of the camps.
Jews, homosexualls, gypsies, mentally handicapped, and other "enemies" of the Nazis
Anne frank, Margot frank, their family and people they hid with. If you do some reasearch, I'm sure you'll find some answers.
stuff
They would have been killed treated inhumane or sent to concentration camps.
some did, some didn't.
yes