This study examines the interaction between NGOs, the Local Education Authority (LEA), and public schools in communities of different socioeconomic backgrounds in Israel. We characterize how schools serving more and less affluent communities create, cultivate, and preserve interactions with NGOs; how NGOs form, and sustain interactions with schools serving communities of different socioeconomic backgrounds, and how this process is maintained through LEA regulation. The methodology is based on qualitative research principles involving data collection by means of in-depth interviews with different stakeholders including school principals, involved teachers, LEA representatives, and NGO directors and staff members. We show how school-NGO-LEA interaction is largely shaped by the affluence of respective schools' communities within given educational settings. Analysis of interviews conducted with different stakeholders exposed two main themes: (1) the differing capabilities of various actors in this interaction to express agency; (2) the power relations between involved parties, whereby NGO and LEA agents impose a global agenda on local schools (particularly those serving less affluent communities)occasionally in contrast to the needs as perceived by school agents. Our conclusions offer unique insights into the nature and possible consequences of the interaction between third-sector organizations and schools serving communities of different socioeconomic backgrounds.