Community organizers need to know and understand what the bases for collective action are, in order to recognize how their intervention can help making it occur, as well as to give thought to the meaning of their practice. The guidance of political philosophy is essential. Concepts developed by Hannah Arendt in defining the political experience are to that matter containing treasures and may be used by the practitioner as milestones for him/her to support the collective action process. Following a presentation of each of these concepts, they are briefly looked at to explore in which ways they can be transposed to the practice.