The goal of this master's thesis is to review the comprehensive activity of Seljačka sloga, cultural and social organisation of Croatian Peasant Party, in the county of Karlovac. Seljačka sloga started with the activities in the 1920s, but in this paper the focus is on the activites from 1935, when the organization was restored, until the start of World War 2 in Yugoslavia in 1941. The branches of Seljačka sloga were founded all over the county of Karlovac which was in the top in the Kingdom of Yugoslavia according to the number of them. The paper examines how active the branches were and in what areas of the peasants lives. Their activities can be divided into cultural, educational, juridical and economic. On the cultural field, the branches worked to restore and preserve folk costumes, folk songs, dances, and customs, and to organize peasant culture festivals on which the entire peasant art work was displayed. The educational plan involved spreading literacy among the peasantry, reading and publishing books and holding numerous lectures related to all areas of life. Juridical and economic activities included the Courts of Good and Honest People, the establishment of cooperatives and committees for economic assistance to peasants, but also to help the disadvantaged. Although the branches were primarily engaged in cultural activities and the work on literacy of peasants, it would not be appropriate to distinguish these activities from their other activities, since all activities were very significant for all peasants and members of the branches of Seljačka sloga.