A/HRC/29/47 could promote racist rhetoric and, as such, constitutes hate speech under article 4 (a) of the International Convention on the Elimination of All Forms of Racial Discrimination. He welcomes the fact that Holocaust denial is clearly considered a crime in a number of countries. 32. The Special Rapporteur continues to call for the active preservation of Holocaust sites that served as Nazi death camps, concentration and forced labour camps. He encourages States to take concrete measures, including legislative and educational ones, such as inclusion of education about the Holocaust in school curricula, so as to prevent revisionism of the Second World War, the denial of the Holocaust and the Nazi genocide and the glorification of Nazi criminals, which lead to the growth of neo-Nazi, xenophobic and anti-Semitic sentiments and serve to provoke inter-ethnic conflicts. VI. Good practices in countering extremist political parties, movements and groups, including neo-Nazis, skinhead groups and similar extremist ideological movements 33. While not exhaustive, the examples of good practices presented below, as noted in the previous thematic reports of the Special Rapporteur (A/HRC/23/24 and A/HRC/26/50), have been developed to counter extremist political parties, movements and groups and provide an overview of some the legislative, policy and institutional measures taken by States in different areas that could serve as models and be adapted to a local context. Such measures taken by States have also been complemented by initiatives developed by civil society organizations. 34. The Special Rapporteur notes with appreciation that a growing number of States have included prohibitions against racial discrimination and xenophobia in their domestic legislation. Furthermore, an increasing number of States have incorporated the International Convention on the Elimination of All Forms of Racial Discrimination into their domestic law, and have recognized the competence of the Committee on the Elimination of Racial Discrimination to receive and consider communications from individuals or groups of individuals claiming to be victims of a violation by the State of any of the rights under article 14 of the Convention. 35. In addition, the Special Rapporteur welcomes the fact that a growing number of States, particularly in Eastern Europe, have either enacted specific laws, or introduced amendments to their Criminal Codes, with provisions on aggravating circumstances for offences committed on the grounds of persecution or hatred based on race, religion or nationality, or for the purposes of completely or partially annihilating a national, ethnic, racial or religious group or individual. In some countries, there are enhanced penalties for murder and causing bodily harm committed with racist or xenophobic motives and criminalization of organized violence at sporting events. 36. The Special Rapporteur notes that some countries have included provisions in their migration and refugee laws that reaffirm the principle of non-discrimination and require the relevant institutions in charge of issues relating to migrants and refugees to take all the necessary measures to prevent discrimination against those groups. 37. In some instances, the above-mentioned legislative developments have also been accompanied by the establishment of specific institutions such as national human rights institutions or ombudspersons, in accordance with the Paris Principles, to receive and consider complaints and investigate cases of racism, racial discrimination, xenophobia and related intolerance and/or communications referred to in the International Convention on the Elimination of All Forms of Racial Discrimination. In particular, the Special Rapporteur 10