Originally posted by Don Sonny Corleone:
But this also brings up the question of if Fredo had told Mike in Havana what he was trying to, would he have been killed?
Probably not. He probably would still have waited until after his mother died.
Originally posed by DontForgetTheCannolis: Why then afterwards wouldn't he help out the Family and show his loyalty to the Family by telling Michael about how Roth was gonna set up Pantangelli?
Fredo probably didn't know that Pentangeli was alive before Michael found out--and Michael found out before he met with Fredo. I think the one thing he told Michael that Michael didn't know was that the Senate lawyer, Questad, "belongs to Roth."