Night Why were the prisoners in charge of eliezers block removed from this position?

In "Night" by Elie Wiesel, the prisoners in charge of Eliezer's block were removed from their positions because they were no longer deemed useful or were replaced as part of the camp's constant reshuffling. This often happened when the guards sought to eliminate any semblance of authority or cooperation among the prisoners, as it could pose a threat to their control. Additionally, the constant fear and brutality within the camps meant that even those who held power among the prisoners could be dispossessed at any moment.