Kapo
The second-most powerful kapos were the Blockältester (block or barracks leader) and the Stubenältester (room leader). The Blockältester was in charge of the prisoners in the barracks, and making sure they followed the rules. The Stubenälteste was in charge of a specific room within a barracks. He had to force the prisoners to make the barracks neat and clean. He was also in charge of the room's hygiene, like killing lice (which spread diseases like typhus).