In recent decades, the project of radically transforming societies to create communities that are in some sense 'socialist' has undergone a profound crisis. This crisis has sometimes looked like a complete collapse of the radical Left. In this paper, I make the case for a cautiously optimistic assessment of the prospects for a self-reinvention by the North American radical Left, on the basis of grassroots organizing for a non-statist, egalitarian and participatory-democratic alternative to capitalism.