My supervisor and head of center is doing unethical things and I am in the middle
Sorry for making an answer, but still without enough reputation to comment.

That is a very tricky situation, I can imagine, even more because you have colleagues that simply don't care. I see that the question is already one month old, but I just wanted to point out, in addition to the other comments, that sometimes universities or departments have some sort of complaint and review procedures, rather than just send an email to the dean. 

I would just like to also add that I hope you don't give up on trying to make academia a "better place". Academia is full of people that are "untouchable", and if no one complains, it will stay like that forever. I wish you good luck and if you found some procedure or detail that might be useful to others in the same situation, it would be great if you can write them down here.