This thesis is aimed at showing the development of public relations as a profession, using Grunig's and Hunt's 4 models, as well as naming and explaining different techniques of public relations. Furthermore, it explains activism mentioning most important aspects of theory and identifying its various forms and mechanisms. Two methods were used for the purposes of the research; content analysis and survey questionnaire. Content analysis included 129 croatian activist organizations, while only 39 organizations completed the survey questionnaire. The results show that most Croatian activistic organizations recognize the importance of public relations, use them on a daily base and use various PR techniques, with Internet being the leading technique, more specifically social networks and websites. Out of 129 analyzed organizations, 110 use Facebook, proving it to be the most widely used social network. However, the results also show that the majority of organizations do not have any financial investments in public relations, followed by organizations that invest 1 to 5 percent of their total finances. This research shows there is room for improvement of public relations in the realm of activist organizations, which would benefit both the profession of public relations as well as activist organizations themselves. Bigger financial investments should result in better communication with key publics and more efficient goal accomplishments.