Which Godfather gangster is the true don?

Don Vito Corleone (Marlon Brando)

Hyman Roth (Lee Strasberg)

Santino "Sonny" Corleone (James Caan)

Fredo Corleone (John Cazale)

Tom Hagen (Robert Duvall)

Vincent Mancini (Andy Garcia)

Michael Corleone (Al Pacino)

Moe Greene (Alex Rocco)