The Oxford Thesaurus An A-Z Dictionary of Synonyms - faction n.

1) group, cabal, bloc, cadre, camp, splinter group, circle, camarilla, clique, set, coterie, lobby, pressure group, junta or junto, ring, gang, Brit ginger group, Colloq crowd: There is a small faction plotting to assassinate the finance minister. 2) dissension, intrigue, strife, sedition, disharmony, discord, disagreement, quarrelling, contention, controversy, infighting, rupture, split, rift, schism, clash: Faction within the party has no regard for national interests.