Oskar Piotrowski | Grzegorz Turnau | Grzegorz Fitelberg | Tadeusz Piotrowski | Robert Piotrowski | John L. Piotrowski | Grzegorz Rozenberg | Grzegorz Pojmański | Grzegorz Lato | Grzegorz Kajdanowicz | Grzegorz Halama | Grzegorz Bronowicki |
Grzegorz Piotrowski (who was also responsible for the murder of Father Jerzy Popiełuszko), to have Krupski strip completely naked before the acid was dumped on him so that the mixture would burn through his skin, damage his internal organs and kill him.