Jasenovac concentration camp
When Roma people (Gypsies) arrived in the camp, they did not undergo selection, because they were all scheduled to be killed.  They were taken to Gradina.  In between massacres, the men would be forced to work on the dike, and the women would be forced to work in the cornfields in Ustice.  Eventually, they would all be killed.  Thus Gradina and Ustice became Roma mass grave sites.  The Ustaše killed more and more people Gradina, until it became the main killing-ground in Jasenovac. Grave-sites were also located in nearby Ustica and in Draksenic.