Actuually, you don't even need to sue. Just file your taxes as if you are an employee and the IRS will handle the rest.
EDIT: See here: https://www.irs.gov/businesses/small-businesses-self-employe...
> You are not an independent contractor if you perform services that can be controlled by an employer (what will be done and how it will be done). This applies even if you are given freedom of action.
I was fired from my "contracting" job, and the state eventually ruled that I was technically an employee. But I had to wait the longest 6 weeks of my life to find that out, and what if they had not? Or what if they ruled against me, and I had to appeal it? What if my former employer retaliated in other ways? I would have been even more screwed than I was.
I'm not sure what else you can ask the state for without severely limiting the economy -- any investigation by the state is going to take time and there will be ambiguity. But, if your work was directed explicitly (such as being told you had to do it), you are pretty much guaranteed you are an employee. The IRS is really nice and they will act on your behalf.