This book, gives a detailed information why 53 people of VELES were murdered in 1945. Most of them were noted as Pro-Bulgarian Fascist and collaborators and traitors. But whether all of them supposed to be killed, the historians needs to clear that question out. However, some of these surnames are still known ProBulgarians and are working against Macedonia and Macedonian people.
I couldn't find the whole book and once I have it it will be uploaded.