Together with German police, the squad participated in the Ponary massacre, where some 70,000 Jews were murdered, along with estimated 20,000 Poles and 8,000 Russian POWs, many from nearby Vilnius. YB was created to kill people and it killed people during its entire existence. It carried out most of the murders in 1941. YB killed people in Paneriai, Nemenčinė, Naujoji Vilnia, Varėna, Jašiūnai, Eišiškės, Trakai, Semeliškės, and Švenčionys. YB killed tens of thousands people, mostly Jews.