Corruption is a social phenomenon that has developed throughout history and permeated almost every form of society. Its existence significantly affects the quality of life of citizens within a state and it is of great importance to know the laws, measures and activities that affect its suppression and control in society. Every form of anti-corruption activity is a step forward that cares about improving the lives of many people, economic well-being and the quality of life of the whole community. Anti-corruption activities vary from country to country, but their goal is basically the same. This paper provides an overview of anti-corruption activities carried out in the Republic of Croatia, Bosnia and Herzegovina and Slovenia. Each form of activity aimed at fighting corruption is shaped in a certain period of time and defines in detail the roles of individual state bodies. Although the whole process of fighting corruption is prescribed at the level of state and public bodies of one state, each country emphasizes the importance of communication of each citizen individually. Judicial practice in combating corruption in the Republic of Croatia is the last part of the work that analyzes three decisions of the Constitutional Court related to deciding on constitutional complaints filed by: civil servant (judge of the Municipal Court in Split), civil servant (head of the State Inspectorate in Varaždin) and public Officer (Police Officer of the Ministry of the Interior of the Republic of Croatia, Police Administration - Primorje-Gorski Kotar, Third Police Station Rijeka).rcegovini; korupcija u Sloveniji; suzbijanje korupcije u Republici Hrvatskoj