Legal Question in Administrative Law in California

Most employment is "at will," and an employee can quit or be terminated at any time. We sometimes say an employee can be fired for a good reason, or for no reason at all, but not for a bad reason..... which category would include race, sex and religion discrimination, whistle-blowing, and a few others. The most common exceptions to at-will employment are where there is a contract of some kind between the employer and the employee, either an individual agreement or a union collective-bargaining agreement.