How prisoners were killed in concentration camps?

Answer 1

A number of ways. One of the most horrible ways were the use of Gas Chambers, which pumped out the oxygen while pumping in deadly carbon monoxide.

Another "method" for killing people was the art of slow hanging, in which the prisoner was bound and then slowly lowered while a noose was around his/her neck.

But these are just a few of many gruesome methods.

Answer 2

They were killed in many ways in German camps:

In extermination camps with exhaust fumes or pesticide.

Some were punished by putting into cells to die slowly by suffocation or starvation/dehydration.

The means used anywhere could be applied either to show a punishment, like hanging or beating, or shooting of those that could cause commotion.

Some people were buried or cremated alive, especially children.

Some people were selected to make generally lethal medical experiments, e.g. how long does a person survive in water of a few °C.

In Japanese camps, decapitation or sun exposure until death could be used.

In Soviet camps, shooting was probably the most common direct killing method.

To save bullets, it is reported that people could be run over with heavy vehicles, but that might not have been in camps. Generally order was maintained keeping people thinking that they will survive if they just obey orders and work, that the trouble makers are those who get executed. After some time, though, people at camps like Auschwitz-Birkenau, understood that their way out was through the chimney. Only non-Jews were at Auschwitz I, where it said "Arbeit macht frei", and they weren't normally condemned to death unless they fell sick and couldn't work any more.

But, generally, in all places, one typical method was having people to work very hard under malnutrition, causing all kinds of medical conditions leading to death. That was even declared explicitly, e.g. by Stalin. Also the POW in the camps in USA weren't released when Italy became an ally, but they had to continue working there. However, survival rates were rather good (above 95%) in the North American and British concentration camps, although the Red Cross could be denied inspection visits. The Allies could use hanging or firing squad to execute a death condemned person.

Answer 3

Often by shooting, but that wasn't efficient enough for the Nazis, so they introduced mass gassings.