▁camp ▁bad ges . ▁Jews ▁wore ▁yellow ▁stars , ▁other ▁prisoners ▁wore ▁colored ▁tri angles ▁pointed ▁down ward . ▁ ▁Pr ison er ▁function aries ▁were ▁often ▁h ated ▁by ▁other ▁prisoners ▁as ▁Naz i ▁hen ch men ▁and ▁were ▁sp at ▁upon . ▁While ▁some ▁bar rack ▁leaders ▁( block äl test e ) ▁tried ▁to ▁assist ▁the ▁prisoners ▁under ▁their ▁command ▁by ▁secret ly ▁helping ▁them ▁get ▁extra ▁food ▁or ▁easier ▁jobs , ▁others ▁were ▁more ▁concerned ▁with ▁their ▁own ▁surv ival ▁and ▁to ▁that ▁end , ▁did ▁more ▁to ▁assist ▁the ▁SS . ▁ ▁Ident ified ▁by ▁green ▁tri angles , ▁the ▁be fr ist eten ▁Vor be ug ung sh äft ling ▁or ▁" B V " ▁(" tem por ary ▁prevent ive ▁cust ody ▁prisoner ") ▁kap os , ▁were ▁called ▁" prof essional ▁crim inals " ▁by ▁other ▁prisoners ▁and ▁were ▁known ▁for ▁their ▁brut ality ▁and ▁lack ▁of ▁sc ru ples . ▁Indeed , ▁they ▁were ▁selected ▁by ▁the ▁SS ▁because ▁of ▁those ▁qual ities . ▁According ▁to ▁former ▁prisoners , ▁the ▁criminal ▁function aries ▁were ▁more ▁apt ▁to ▁be ▁helpful ▁to ▁the ▁SS ▁than ▁political ▁function aries , ▁who ▁were ▁more ▁apt ▁to ▁be ▁helpful ▁to ▁other ▁prisoners . ▁ ▁Dom ination ▁and ▁terror ▁The ▁SS ▁used ▁dom ination ▁and ▁terror ▁to ▁control ▁the ▁large ▁camp ▁populations ▁with ▁just ▁a ▁few ▁SS ▁gu ards . ▁The ▁system ▁of ▁prisoner ▁function aries ▁was ▁a ▁" key ▁instrument ▁of ▁dom ination " ▁in ▁the ▁concentration ▁cam ps