What sort of jobs did the Jews do in the concentration camps?

After the Jews had been arrested and sent to concentration camps, they were forced to work unfair jobs.

For example, the Jews were sent to nearby Nazi houses to feed them and be their slaves.

Another thing they had to do was build. They would build anything the Nazis wanted them to.

After about a month of that, the Jews were told they were going to a shower, and killed by a very dangerous gas.