This article analyses the amendments of January 2018 to the Act on the Institute of National Remembrance (INR) of 1998, which has raised doubts in light of in ternational law and provoked diplomatic tensions between Poland on one side and Germany, Ukraine, United States of America and Israel on the other. The INR is a national in stitution whose role is, among others, to prosecute perpetrators of in ternational crimes committed between 1917-1990. The article proves that the wording of the amendments is in consistent with in ternational law, as it ignores the principles of in ternational responsibility, definitions of in ternational crimes, and disproportionately limits freedom of expression. In consequence, it cannot be expected that third states will cooperate with Poland in the execution of responsibility for violation of the newly adopted norms.

This article discusses definitions of crimes included into the Act of 18 December 1998 on the Institute of National Remembrance – Commission for the Prosecution of Crimes against the Polish Nation, and their usefulness in prosecuting individuals who committed international crimes. It is argued that the provisions of the Act cannot constitute a ground for criminal responsibility of individuals, as they violate the principle of nullum crimen sine lege certa.