It is well known that Tom Hagen is the greatest character in the GF Trilogy, so I have a few questions regarding the good man.

1. Is Tom aware of the hit on Fredo? I really don't think so as I can't see Tom going for it.

2. Why does Michael always treat him badly. In GFI he explains why Tom is no longer consiglieri but I don understand why he is very harsh in the way he tells him. Same applies in Part II at the end with the meeting with Neri and Rocco why is Michael like that with Tom? Where as near the beginning of the film he explains to Tom how much he loves and trusts him etc

Also I read that in Part III the original idea was to be a struggle against Tom and Michael, I'm glad this didn't happen as it would be a shame to see Tom get murdered.