Article 2253

an employee’s race, color, nationality, language, sex, religion, lineage, pregnancy, marital status, family responsibility, disability, political orientation or economic or social status;

the absence of the employee if that absence is due to the employee’s participation in legally-required public service, including National Service, or to an medically certified illness or injury;

participation of the employee in legally-sanctioned activities as an employee representative or as a member of an association of employees;

submission by the employee of a labor grievance against the employer or participation in a legal proceeding against his employer; and

refusal to work on a dangerous assignment ordered by the employer.