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and the person who played Sal

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Fredo (John Cazale) was always great.

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Indeed, he was in 5 feature length movies and the five of them are classics. All five of them were nominated for best picture and three of them won in the Oscars. Note that Conversation battled versus Godfather II for the Oscar.

Movies he was in:

Godfather I (won the Oscar)
Godfather II (won the Oscar)
The Conversation (nominated for the Oscar same year Godfather II)
Deerhunter (won the oscar)
Dog Day Afternoon (nominated for the Oscar, lost to Cucko's Nest).