Einsatzkommando
During World War II , the Nazi German were a sub-group of the "" ( mobile killing squads ) – up to 3 , 000 men total – usually composed of 500–1 , 000 functionaries of the SS and Gestapo , whose mission was to exterminate Jews , Polish intellectuals , Romani , and communists in the captured territories often far behind the advancing German front . 
<triplet> Nazi German <subj> World War II <obj> participant in <triplet> SS <subj> World War II <obj> conflict