Should I report him?

My boss is very nasty and mean to me all of the time for no reason at all. He begrudges me of the relationship that I have with one of my co-workers that he does not get along with. Recently I worked hours that would be considered overtime and did not get compensated for them. I researched the issue with the Labor and Industry as well as Wage and Hour and other sources as well and they all told me that I deserve the overtime pay. If I report him he would get a minimum $10,000 fine and they would audit him. I'm sure he knows the law and just thinks that I'm stupid and am not going to take further action. What should I do?