The use of collaborations and partnerships that engage a variety of actors from both the public and private spheres has drawn attention during the last decade as a promising strategy for combatting trafficking and improving assistance to victims of trafficking. This article investigates the Swedish Civil Society Platform against Human Trafficking as an example of successful collaboration between civil society actors. The aim is to explore how the platform as a distinct organizational form is capable of dealing productively with some of the challenges facing internal and external collaboration. We utilize interviews with key actors and a study of policy documents as we argue that the modularity and flexibility of the platform organizational form are key factors in its success. While it is a robust type of organization that may be regarded as a trustworthy partner, it also permits its member organizations to continue functioning as independent entities.