Human rights, usually perceived as a man being born with them already embedded within themselves, are the rights inseparable from our nature and the ones we can not live without as human beings, as they are the ones allowing us to completely develop and properly use our human qualities, intelligence, talents and conscience, so we can satisfy our spiritual and other needs. Human rights are expressed in contracts, customary international law, legislative bodies and other law sources. Despite of legal basics of human rights, there are cases in which they are violated. Those cases are exactly the ones through which we discuss hate speech, discrimination and violence as a violation of human rights, as well as criminal acts. Croatian practice shows that exactly those three phenomena affect two highly vulnerable groups in Republic of Croatia: Serbian ethnic minority, as the biggest minority group in Republic of Croatia, and the LGBT(IQ) community, which deviates from traditional norms prevailing in our country. Accordingly, this thesis shows to what extent fundamental human rights of those two vulnerable groups are being respected in the Croatia and the function of social work in the form of promotion and protection of fundamental human rights as well as prevention of hate speech, discrimination and violence as extremely negative and undesirable practices of Croatian legal system.