▁book ▁about ▁Jewish ▁kap os . ▁ ▁Many ▁prisoner ▁function aries , ▁primarily ▁from ▁the ▁ranks ▁of ▁the ▁" gre ens " ▁or ▁criminal ▁prisoners , ▁could ▁be ▁quite ▁brut al , ▁especially ▁when ▁an ▁SS ▁guard ▁was ▁around , ▁in ▁order ▁to ▁justify ▁their ▁privileges . ▁They ▁also ▁played ▁an ▁active ▁role ▁in ▁the ▁beat ings , ▁even ▁killing ▁fellow ▁prisoners . ▁ ▁One ▁non - c riminal ▁function ary ▁was ▁Josef ▁He iden , ▁a ▁not orious ▁Aust rian ▁political ▁prisoner . ▁Fe ared ▁and ▁h ated , ▁he ▁was ▁known ▁as ▁a ▁sad ist ▁and ▁was ▁responsible ▁for ▁several ▁death s . ▁He ▁was ▁released ▁from ▁D ach au ▁in ▁ 1 9 4 2 ▁and ▁became ▁a ▁member ▁of ▁the ▁W affen ▁SS . ▁Some ▁function aries ▁were ▁personally ▁involved ▁in ▁the ▁mass ▁murder ▁of ▁other ▁prisoners . ▁Begin ning ▁in ▁October ▁ 1 9 4 4 , ▁re ich deutsch ▁criminal ▁function aries ▁were ▁sought ▁out ▁for ▁transfer ▁to ▁the ▁Dir le w anger ▁Brigade . ▁ ▁R anks ▁of ▁function ary ▁The ▁important ▁function ary ▁positions ▁inside ▁the ▁camp ▁were ▁L ager äl test e ▁( camp ▁leader ), ▁Block äl test e ▁( block ▁or ▁bar ra cks ▁leader ) ▁and ▁St uben äl test e ▁( room ▁leader ). ▁The ▁highest ▁position ▁that ▁a ▁prisoner ▁could ▁reach ▁was ▁L ager äl test e . ▁He ▁was ▁placed ▁directly ▁under ▁the ▁camp ▁command ant , ▁had ▁to ▁implement ▁his ▁orders , ▁ensure ▁that ▁the ▁camp '