Petrit Latifi
It is well documented that the Serbian government would use Serb terrorist groups like “The Black Hand” (Crna Ruka) to massacre Albanians in the 1920s. In 1921, a newspaper cited the following:

“The Albanian Press Bureau reports that the Serbian committee Tserna Ruka (Black Hand), supported by the Yugoslav army, set fire to 300 Albanian houses in the districts of Pejë and Gjakova. 350 men, women, and children were massacred. More than 900 houses were looted and 12,000 animals were abducted.”
Reference