Based on Wilhelm being a Kapo, Moshe and Vladim can benefit from being civil to Wilhelm because C. He might require less of them when they are working on a project.
The Kapo were Jews in concentration camps that the Nazi SS had appointed to a position of authority of supervising projects and the forced Jewish labor on those projects.
This means that if Moshe and Vladim are civil to Wilhem, he might give them less work to do on a project.
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