The expression "collective liberties", used until now to designate the liberties of the Second Generation, does not fully represent the content of those liberties. Those liberties are not the affirmation of the collective right over the individual right, but of the individual liberties becoming effective when applied collectively. To best feature their complexity, a new term should be proposed: social libertyIt is necessary, to justify this new term, to study the genesis of those liberties, through a legislative, jurisprudential, political and doctrinal analysis. The observation of the organic corporation of the Middle Age reveals a difference of nature with the free association. Its singularity will only appear at the end of the XIX century, through a modern definition and a renewal of the order paradigm.