The article explores the practices of fathers' associations in the Russian Federation as subjects of civic activism in the field of child protection and the prevention of destructive behavior among the younger generation. In the context of the transformation of the institution of fatherhood and the active involvement of fathers in child care, communities of active fathers are playing an increasingly important role by implementing a number of socially significant initiatives, particularly in the area of child protection. The aim of the study is to understand the experiences of fathers' communities in preventing threats to the physical, psychological, and social well-being of minors. The theoretical and practical significance of the research lies in the conceptualization of the role of fathers' associations as a specific subject of child protection, presenting relevant empirical data on the activities of communities, their results, and social effects. The empirical base was formed within a mixed research strategy: at the first stage, an analysis of official sources of fathers' communities was conducted, and the main directions and formats of their activities were systematized; at the second stage, field research was implemented in the format of 12 focus groups (involving activist fathers and adolescents aged 14–17 who participated in community projects). The author concludes that public activism of fathers in Russia has transformed from spontaneous private initiatives into a full-fledged ecosystem of engaged fatherhood, represented by an extensive network of fathers' associations. Key areas of activity in this field include ensuring safety on roads, in water bodies, in everyday life, in the digital environment, monitoring the quality of children's nutrition, preventing smoking and substance abuse, countering bullying and destructive content, as well as preventing minors from engaging in illegal activities. The formats for achieving these goals include organizing parent patrols and monitoring raids, conducting educational lectures, workshops, round tables, creating social advertising and methodological materials, joint activities with children, and participating in legislative initiatives. Studying subjective perceptions revealed that this activity catalyzes the transformation of fatherhood identity towards greater involvement in problems and child-rearing processes, contributes to an increase in social capital, strengthens intra-family ties, and enhances the educative potential of fathers. Adolescents evaluate the events organized by fathers' communities as a trustworthy alternative to formal school prevention, noting the practical applicability of the skills acquired.