Legitimate differential treatment in labor relations

The substantiation of the concept of non-discrimination was initially made in relation to the recognition of the principle of equality, being established certain criteria that constituted a hard core of the regulations necessary to achieve protection. The national states have regulated in this matter by establishing in national legislation specific rules, initially found at the constitutional level, in the legal labor relations determining equal access to the labor supply. Subsequently, under the influence of interpretations of case law, the rules of non-discrimination were found at the level of organic laws, as a way for national courts to respond to solutions issued by European courts.