Could be him:
Berek BRATSZTAJN
#polish #jew https://www.ushmm.org/online/hsv/person_view.php?PersonId=4100038 https://www.ushmm.org/online/hsv/person_view.php?PersonId=5396117 https://www.ushmm.org/online/hsv/person_view.php?PersonId=4238278