Book excerpt: The growth and spread of non-governmental organizations (NGOs) at local and international levels has attracted considerable interest and attention from policy-makers, development practitioners, academics and activists around the world. But how has this phenomenon impacted on struggles for social and environmental justice? How has it challenged - or reinforced - the forces of capitalism and colonialism? And what political, economic, social and cultural interests does this serve? NGOization - the professionalization and institutionalization of social action - has long been a hotly contested issue in grassroots social movements and communities of resistance. This book pulls together for the first time unique perspectives of social struggles and critically engaged scholars from a wide range of geographical and political contexts to offer insights into the tensions and challenges of the NGO model, while considering the feasibility of alternatives.