I finally saw the Godfather

[GonzoStyle]

just one thing i didn't get. what did abe vigoda do that got him killed?

Remember in the scene with brando and pacino when they are outside drinking wine when brando does the "you coulda been senator corleone, governor corleone"

anyway he warned him that he would be betrayed by someone close to him, the man who sets up a meeting with barzini to offer a deal "too sweet to pass up". During brandos funeral when Duvalls character says "I thought it woulda been clemenza" and Michael says "Tessio was always smarter". He was talking about the meeting that brando warned him about, clemenza was too loyal and dumb.