Revocation of citizenship means a substantial interference with individual rights. It can only be justified if tightly defined material conditions in accordance with the constitutional law of each country and its international commitments are fulfilled. Risk assessment and proof of an affiliation, assistance or membership in an international terrorist organisation will be essential elements in this procedure. Whether there is a practical value in revocation of citizenship for citizens engaged in international terrorism in addition to criminal and administrative sanctions is within the framework of law a matter of political expediency which may well lead to different results in different countries.