Interest group coalitions play a pivotal role in shaping the decision-making process across various policy domains. This study analyzes how a coalition of interest groups can be formed and what factors unite them that enable them to influence the public policy-making processes. The research was conducted in Subang, West Java (one of the largest rice production regions in Indonesia), where a coalition of interest groups known as the People’s Coalition for the Constitution (Koalisi Rakyat untuk Konstitusi or KORSI) opposed the proposal of three new industrial zones during the local legislative processes. Data for the study were collected through 1) in-depth interviews with key actors involved in the coalition and the legislative processes, 2) participant observations, and 3) document analysis. The study reveals that the formation of the coalition was influenced by shared issues, closed interactions, trust, egalitarianism, interdependence, value agreement, and deliberation. The oppositional stance to reject the new industrial zones proposal became a common ground that united various interest groups within the KORSI. The coalition was further strengthened by the intensity of interactions, mutual trust, and a sense of equality among its members, as well as an awareness of each organization’s limitations, which fostered recognition of their interdependence. Moreover, the coalition remained deliberative toward any organization willing to join, thereby expanding its network and enhancing its capacity to influence public policymaking processes.
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