Prosecution of war crime in the former Yugoslavia in the war conflicts of the 1990sproved to be factually difficult legally complex and extremaly politically sensitive. The gravity and large number of war crimes committed shows that these crimes very offen had the support of the political elites and ruling parties of the time. It is more than certain, and thus the conclusion is that their ulitimate goal was to create ethnically homogenuous political communities and that carrying out ethnic cleanging was part of the war. In order to more successfully develop such issues, the thesis is planed as follows. In the introductory chapter, the author considers it opportune to show what the Homeland War was and all its characteristics. In addition they will show chronologically how and why the territory of the Republic of Croatia, and all that the so-called JNA as a „people's army“, volunteer units brought in from Serbia and rebel Serbs did in that area. From the aspect of these events (expulsion of the domicile population from their own homes, killing innocent civilians, etc), certain behaviors of Croatian officials who were sentenced to high prison terms should be viewed more realistically. In the second chapter, the author will try to historically show when and how war crimes began to be processed. Based on a report by the Carnegie Endowment for Peace, which lists numerous violations of international conventions and describes war crimes commited during Balkan wars, the beginnings of the creation of international law, especially international war and humanitarian law, are the beginning.Mention should certainly be made of the trials that took place in Nuremberg as a precursor to the formation of the International Criminal Court in the Hague and that influenced International Law. The Croatian public especially remembers the trial of our generals which will be discussed in this chapter. In the third chapter, he will retrospectively examine the court verdicts of the so-called Gospić group through court files and try to look at the whole process in time from the aspect of legal and real facts, war law, war environment at the time of the crime. In the final fourth chapter trough the conclusion, it will sublimate the comprehensive issues that permeated the previous chapters with an emphasis on personal attitude and commentary on the entire topic of the thesis.