10 of the Most Memorable Betrayals in Movies

What we do know is that as a result of Fredo's betrayal, Roth's men are able to make an assassination attempt on Michael's life at his family home. While Fredo was acting out of jealousy and ignorance, the severity of his treachery is such that Michael eventually decides that he should be assassinated. After all, betrayal is taken very seriously within the Mafia, and when it's coming from your own brother, innocent and stupid as he may be, it's considerably worse.