Legal Question in Employment Law in California

Not only are there no laws against 'unfair treatment' or poor management, but in general, unless an employee is civil service, in a union, or has a written employment contract, they are an 'at will' employee that can be hired, disciplined or fired any time for any reason, with or without �cause�, explanation or notice, unless it is based upon illegal discrimination, harassment or retaliation as defined under the ADA [disability], Civil Rights [age, race, sex, ethnic, religion, pregnancy, etc], FMLA [medical leave], Whistle-blower, or similar statutes.