Coppola gave us enough ammunition! in just this one dialogue
among others
Johnny Ola: Fredo, this is Johnny – Johnny Ola We need some more help
Fredo: Johnny, Jesus Christ, what the hell time is it?
Johnny Ola: Listen good, Fredo
Fredo: What are you calling me here for? I don't want to talk to you
Johnny Ola: Pentangeli set up a meeting with the Rosato brothers -- says he's gonna go for their deal
Fredo: Oh, God --
Johnny Ola: Will he come alone?
Fredo: I don't know anything -- you got me in deep enough already
Johnny Ola: Just go along, everything will be alright [after Michael's murder in Havana]
Pentangeli says he's willing to make the deal All we want to know is if he's on the level or if he's gonna bring his boys....
Fredo: You guys lied to me -- I don't want you to call me anymore
Johnny Ola: Your brother's not going to find out we talked
Fredo: I don't know what you're talking about
Ola knew Fredo wouldn't know anything about Pentangeli-Rosatos meeting, let alone....same as “Fredo obviously wasn't in on Michael's Cuba discussions and couldn't pass on inside info to Ola”
I believe, the phone call was a warning, veiled threat “Your brother's not going to find out we talked”
Don't go squealing to your brother or else....
and to let us, the audience know who is the traitor in the family
