entitles each alien to a decision in his own case and, hence, article 13 would not be satisfied with laws or decisions providing for collective or mass expulsions. This understanding, in the opinion of the Committee, is confirmed by further provisions concerning the right to submit reasons against expulsion and to have the decision reviewed by and to be represented before the competent authority or someone designated by it. An alien must be given full facilities for pursuing his remedy against expulsion so that this right will in all the circumstances of his case be an effective one. The principles of article 13 relating to appeal against expulsion and the entitlement to review by a competent authority may only be departed from when “compelling reasons of national security” so require. Discrimination may not be made between different categories of aliens in the application of article 13. 3