The company would not have grounds to sue the other company, since the employment anti-discrimination laws only give employees--not corporations, LLCs, etc.--the right to sue. Your wife also does not have a right to sue, since discrimination is, again, only illegal when directed against employees or in a housing context; she is not an employee, she has no cause of action. Depending on the exact working relationship, it's possible that your Jewish employee may have a cause of action; he or she may wish to consult with an employment law attorney.