Originally posted by goombah:
I agree with Turnbull that Michael had been suspicious of Fredo even before the New Years party confirmed Fredo's guilt. I think Michael may have begun suspecting Fredo all the way back to the night of the Tahoe shooting.
goombah, I do recall Micheal responding to Tom that it is possible that anyone can be a traitor because all his people are businessmen. Having said that, not only was Michael suspicious of Fredo, he as suspicious of everyone, including Tom, Al, and Rocco.