Who was least likely to be executed in the Concentration Camps?

the guards..

The guards and the Commandant.

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presumably you mean out of the inmates;

the problem was that any inmate could be killed at any time for no apparent reason.

but if one were to suggest a group that was least likely to be executed (as opposed to die - that would be a different answer), it would be the doctors or the workers in 'Kanada' or the orchestra or other entertainment groups.