The implications of a social movement theory advanced by Jean-Paul Sartre in his "Critique of Dialectical Reason" is examined in this paper. The paper notes that unlike sociologists and rhetoricians who have stressed the psychology of movement adherents, the reasons for movement formation, or the movement's interaction with power agents, Sartre bases his analysis on the forms of organization within the group. The paper then reviews the five forms of groups discussed by Sartre--the series, the fused group, the pledged group, the organization, and the institution--and describes the functions of rhetoric particular to each form. (Author/FL)