The Hungarian Helsinki Committee together with the Polish Helsinki Foundation for Human Rights submitted a third party intervention in the case of Şener v. Poland, appl. no. 53371/18. The case concerns the expulsion of a lawfully staying applicant whose residence in Poland became undesirable, based on classified documents not disclosed to the applicant. As a result, he is unable to exercise family life with his Polish wife and daughter. In the intervention we have highlighted the necessary procedural guarantees in national security cases based on EU law and explain the significance of the case with regard to systemic problems in Poland. Read the intervention here.