The word « non-refoulement » derives from the French repulsor, which means to back down or push back. The idea that, in certain circumstances, a state should not repatriate persons to other states is first referred to in Article 3 of the 1933 Convention on the International Status of Refugees, which states that the contracting parties have arrogated the obligation not to deport or deport refugees residing in their territory, « through the application of police measures such as expulsions or non-accreditation at the border (refoulement) , unless it is security or national order. « In any event, each country has pledged to deny entry to refugees at the borders of their country of origin. » However, the Convention does not simply say who is a refugee. It goes further by specifying the expiry date of refugee status (Article 1C; z.B. in case of voluntary return, acquisition of a new effective nationality or change of circumstances in the country of origin). For specific political reasons, the Convention also excludes Palestinian refugees (at least as long as they continue to enjoy the protection or support of other United Nations agencies (Article 1stD) and excludes persons treated as nationals in their state of refuge (Article 1 E). Finally, the definition of the Convention categorically excludes anyone who has serious reason to believe that he has committed a war crime, a serious apolitical criminal offence or that he violates the objectives and principles of the United Nations before being admitted (Article 1 F). From the outset, the 1951 Convention therefore contained sufficient clauses to ensure that the great criminal and the terrorist did not enjoy international protection. Non-refoulement In the general principle of international law, existing treaties are binding on the parties and must be carried out in good faith. Countries that have ratified the Convention are required to protect refugees who are on their territory in accordance with their conditions.  There are a number of provisions that States parties to the Convention must comply with. The ad hoc committee decided to focus on refugees (stateless people were eventually included in a second convention, the 1954 Convention on the Status of Stateless Persons) and formally submitted a draft convention.
The draft was based on the practice of the IRO under its Constitution, identified a number of categories of refugees, such as victims of the Nazi or Falangist regime and those recognized in previous international agreements, and also accepted the general criteria for well-founded fear of persecution and non-protection (see UN document).