I think your friend needs to go to Radio Shack and purchase a little tape recorder, and use that for all discusions with his loving uncle. BTW, where is his father or mother, thwy should have some say with their sibling, or know how to deal with him.
I agree, if an elder has it in for you, whatch your back, and what you say or do.
If the elders stick together, as is likely, then writing the society is the last bet. Make sure to have lots of information and not to sound like a "whiny" little publisher/sheep.
What is the business of his uncle? Alot of elders I knew were very ruthless businessmen, often cutting legal corners.
From what you've said your friend is just a simple honest person. Good for him. That will not help him in this situation. Trying to be an honorable person when dealing with dishonorable individuals will only defeat you in the end.
It might help for your friend to clarify what his intentions and goals are. Does he want to be an MS, Pionere, publisher...or would he just like to live in peace.
Also, try if you can, help your friend to "see" the big picture of how the elders and the org operate. You probably can't tell him, but help him really see it for what it is; a huge rotten lie. Does he really think that Jesus would have anything to do with a group of men who would behave this way? Who are these guys more like: The Apostles or the Pharisees?
Good Luck