"When I read his description of the sects within Jansenism, the Augustinian
movement in seventeenth century France, I remember being struck by the
comparison with Bolshevik sects of the 1920s (but also some left-wing groupuscules—Maoist, Trotskyist, etc.—that I came
across in the U.S. in the late 1960s and early 1970s)."
¬ Mitchell Cohen, The New Atheism: An Interview with Mitchell Cohen
Groupuscule is a French term describing the political phenomenon in which the far left and right tend toward a proliferation of tiny groups. This is particularly common in Anarchist, Fascist, Stalinist and Trotskyist groups.