Rival boss who orchestrates the war against the Corleones.
Carlo betrays the Corleones by joining Barzini's plot to destroy the family heir.
The plot reveals Carlo was conspiring with Barzini to kill Sonny.
Greene leans on Barzini's power to resist the Corleone takeover of Las Vegas.
Moe Greene openly flaunts his support from Barzini when Michael asks to buy him out.
A wary rivalry between the two most powerful dons in New York.
Vito suspects Barzini, not Tattaglia, was behind Sonny's death, and he negotiates peace with Barzini and the other bosses.
Barzini is the strategic enemy Michael must destroy to secure the family.
Vito tells Michael that Barzini is the real mastermind behind the family's troubles, and Michael has Barzini assassinated during the baptism.
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Related entry on Wikidata (Q458019), public domain (CC0).