SÚM was a loosely affiliated artist's collective that was founded following a 1965 self-organized exhibition of works by Jón Gunnar Árnason, Hreinn Friofinnsson, Sigurjón Jóhannsson, and Haukur Sturluson. In this talk, Pollentier discusses the emergence of SÚM, provides a brief overview of the group's major projects, and examines how the collective practices of its members provided a critique of the political and cultural environment of the 1960s and 70s. She considers the lack of scholarly attention that SÚM has received and the unique challenges that assembling a history of the group presents, despite its significant position in the history of Icelandic art.