My advisor escalated things after not getting a coauthorship he did not deserve I am a 3rd year PhD Student (Computer Science, India). I have two advisors, one internal and one external.

The internal advisor has no knowledge of my area and he doesn’t care what I am doing. He has no contribution to my research so far, but he keeps forcing me to make him co-author (2nd author) of my papers. I am a part-time PhD student (full time faculty in my college) in my college and he is my colleague. He has contributed nothing, did not even know title of my paper.

The external advisor is the one who actually helps me with my research. He wants all authorship to be based on contribution. He is external to my college and lives in a different city.

Recently I refused to make my internal advisor second author of a paper. Due to this, he got upset and he wrote in my progress report that I have attitude problem and I don’t obey my advisor. Now I have to stand in front of the dean, head of department and the entire committee (my advisor will also be there in the meeting with me).

Should I tell the monitoring committee about how my internal advisor unethically tried to manipulate me? Can it worsen the situation in future?
How are 'attitude problem' and not obeying your adviser a 'crime'?  In my university, there is a 'co-authorship policy', which clearly states that any co-authors must have made significant intellectual contributions.  If such a policy exists at your university, I would bring it to support your case.

If you're fronting the committee because of supposedly poor progress, then I would gather as much evidence as possible to support your case. For example, your communication with your external adviser, papers published, etc.

I suggest you change the supervisor. The situation will definitely get worst because it looks like the internal adviser is unethical.  He/she will 'burn you alive'.