The Criminal Code (hereinafter CC) of the Ukrainian SSR (§2, Art.41) only once provided for a crime committed by an organized group as an aggravating circumstance in any crime till 1989 [1]. At the close of 80-s and in 90-s especially the country faced a fast-growing and serious challenge from organized crime that caused a classifying circumstance - a commission by an organized criminal group (hereinafter OCG) amended in 20 articles, the Special Part, CC. Regulations, Session of the Supreme Court and Methodical Instructions, the Ministry of Interior did not give an appropriate definition of OCG. As a result law enforcement and, first of all, the Ministry of Interior agencies did not have strict legislative acts to define OCG from traditional groups of criminals. All the cited above could not but adversely affect the struggle against organized crime. According to the statistical data for 1991-2023, annual Reports on combating organized criminal groups, the Ministry of Interior the status of organized crime is as follows.

The aim of the article is to consider the scientific genesis of the problem of operational and investigative measures to combat intentional homicide by criminal police units. Subject of research is the stages on development of scientific knowledge on the issue under investigation. Methodology: In the course of the research the following methods are used: analysis and synthesis method, dialectical method, logical and semantic method, historical and legal method, legal modeling method. Research results: The state of scientific researches on the problem of crime prevention by the criminal police in general and intentional homicide in particular was examined. Practical consequences: In the course of the research, the development of scientific knowledge on the prevention of intentional homicide by criminal police units was gradually considered. Value / originality: It is the first study dedicated to the development of the history of prevention of intentional homicide by criminal police units in Ukraine.