In this chapter, we introduce the notion of “transgression space” to describe the structure of governance of websites on which the community is characterized by the strong presence of trolls. Trolls are defined as users who constantly challenge the rules of websites they browse through, namely by posting transgressive content. The transgression space corresponds in this perspective to the arena of interactions in such communities. We demonstrate through a case study on the ``BlaBla 18-25’’ forum of jeuxvideo.com that the governance of these transgression spaces can be analysed through the Governing Knowledge Commons framework, allowing us to generalize this notion for other case studies.