The Nazis were involved in the concentration camp Buchenwald because it was a camp for political prisoners.
the Nazis
The people captured by the Nazis were sent to concentration camps. If they did not send you to a concentration camp they would send you to a labour camp. Often they were sent to a 'transit camp' first, till there were enough people for a train-load to a concentration camp. You see in the camps you were not allowed to talk about how wrong the Nazis were because, they felt that after getting rid of them they would finally have a perfect world. But what does perfect actually mean? Figure that out.
No, it was the main camp that the Nazis built in Austria.
auschwiz is a death camp to kill captured victims of Nazis
They wanted to use it as a concentration camp and a extermination camp
Buchenwald, though initially it was called Ettersberg (for a couple of weeks or so).
Sent them to a concentration camp and killed them
No, of course not. If the Nazis decided they wanted to send you to a concentration camp, that was that, and you didn't have any say about which camp, either.
Most of them were directly driven to the gas chambers, but others had to work for the nazis for a couple of weeks or months. In the end, if you were on a train to a concentration camp (or extermination camp) you were dead.
no one, some escaped, but no one resuced them. Those who did not die in the camps would have to wait for liberation or for the Nazis to leave the camp.
First: Dachau Largest: Auschwitz