“(…) they developed a yet more original structure, resting upon very small groups (a factory, a neighborhood, etc), strongly united by the processes of the ‘democratic centralism,’ and yet closed due to the technique of vertical connections: this admirable system of organizing the masses has contributed more to the success of communism than the marxist doctrine, or the poor standard of living of the working classes.” (Maurice Duverger, Political Parties, p. 40; emphasis added)