Cika wannan jumla:
A lokacin mamayewar Jamus na Poland (Yaƙin Duniya na II), a watan Nuwamba na 1939, 'yan Jamus sun kashe' yan Poland da yawa daga Gręblin yayin manyan kisan gillar da aka yi a dajin Szpęgawski a matsayin wani ɓangare na "Intelligenzaktion".