It's true. You can be fired from your job at any time, with or without warning for a false reason, a mean reason, a reason that is unfair or even capricious, just about any reason at all. In fact, you could be fired for reading this book.
Employment law attorney Glenn Solomon explains that the overwhelming majority of working Americans are employed 'at will." They are hired-and can be fired-at their employers will. While there are a few specific kinds of discriminatory termination (based on age, sex, race, etc.) prohibited by law, it is difficult to prove such discrimination in court. Solomon argues that the at-will rule is inherently unjust, since it leaves the livelihood of most Americans subject to their employers' whims.
How can you fight back? Solomon details:
Four exceptions to the at-will rule: how effective are they, and how can you take
advantage of them

Your rights under the current system: how to make the most of them, including
what to consider when deciding whether or not to sue your employer and what to
expect if you do and

An alternative to the at-will rule that protects the rights of both workers and
employers.