Maybe somebody can help me out with this: What exactly did Fredo do to help Hyman Roth and Johnny Ola, thereby betraying his brother Michael?
I’m not sure, but I think he inadvertently helped them set up Michael that time they shot up Michael’s house and tried to kill him.
Speculation was he was the one who opened the curtains in the bedroom when they tried to kill Michael. He also provided key information to the Congressional Committee who was investigating the Corleone Family, knowing the key Senator on the committee was on Roth’s payroll.
However, Fredo claims he had nothing to do with the hit attempt, and only wanted to break out on his own with Roth's help, since he knew he would always be the runt in the Corleone clan with no chance for his own family.
He spoke up for them against the family...one never talks against the family and doesn’t take the other guys side in a discussion....