You can, but I would think carefully about such an action. First, wrongful termination will be very difficult to prove, especially if you signed an "at will" contract, which is common nowadays. NOBODY does their job perfectly, and it's not hard for employers to find a legal reason for letting you go. Second, such a venture would be extremely costly to you. Even if your case was easy, you would have to, at least initially, shell out thousands of dollars in legal fees out of your own pocket, and god forbid if you lost you would still be jobless and then be saddled with all that debt. Third, even if you won your case, and the company was forced to take you back, don't you think your mere presence there would cause a large amount of resentment? Once you went back to work, you would be watched like a hawk, likely in an environment that would be miserable for you, any little mistake you made would be pounced on, and it likely wouldn't be too long before they found a legitimate reason to get rid of you. So, unless there are very STRONG principles involved here, or unless the company is clearly doing something illegal, it's likely in your better interest to just let this go and find a better, more pleasant place to work.