From personal experience on this type of situation, I will tell you that you need to tread very lightly. If you start trying to play the harassment card, YOU will become a liability to the university, which they WILL try to minimize. This may mean that you end up leaving without your degree, or anything to show for those 6 years of your life.
What are you being asked to do for this other students work? Is it possible that you can benefit from this collaboration (collaboration between students is common in my field, though may not be in yours)? If you are close to finishing your degree, and what is being asked of you in not entirely unreasonable, I don't think you would regret backing down and just doing whatever it is you need to do to get out.
With that said, if you are set on pushing this issue then you need to seek legal counsel, and you definitely don't want to contact the media. Absolutely do not discuss this situation with anyone in administration at your school, and if you do, reiterate with this individual that your conversation with them is confidential. Remember that when you open this door, no one there will be on your side as they will be looking out for the best interest of the university.
I hope this helps