A/HRC/35/42 education in combating racism, racial discrimination, xenophobia and related intolerance, in deconstructing prejudices and in promoting the principles of respect and tolerance for ethnic, religious and cultural diversity (see A/HRC/23/56, para. 57). 42. The Special Rapporteur recommends the implementation of comprehensive and mandatory human rights trainings for law enforcement officials and members of the judiciary, with a focus on racist and xenophobic crimes perpetrated by individuals linked to extremist political parties, groups and movements. This would reinforce their capacity to address crimes motivated by racist, xenophobic, anti-Semitic or homophobic biases. (See A/HRC/26/50, para. 54, A/HRC/29/47, paras. 49-50, and A/HRC/32/49, para. 23.) D. Holocaust denial 43. The Special Rapporteur reiterates his absolute condemnation of any denial or attempt to deny the Holocaust, as well as all manifestations of religious intolerance, incitement, harassment or violence against persons or communities based on ethnic origin or religious belief. He urges States to implement effective legislative and educational measures in order to prevent revisionism of the Second World War, the denial of the Holocaust and the Nazi genocide. He recalls the importance of the preservation of the sites that served as Nazi death camps, concentration and forced labour camps and prisons. (See A/HRC/29/47, para. 56, and A/HRC/32/49, para. 24.) E. Disaggregated data 44. The Special Rapporteur maintains his previous recommendations concerning the importance of collecting disaggregated data and statistics on racist, xenophobic, anti-Semitic and homophobic crimes in order to identify the types of offences committed, the characteristics of the victims and of the perpetrators and whether they are affiliated with an extremist political party, movement or group. States should allocate adequate resources to improve the quality of data-collection systems while involving the civil society in the process, which is to be undertaken in such a way as to guarantee the protection of privacy. The collection of such data would enhance a better understanding of the phenomenon and identify effective measures to be taken to address these crimes. (See A/70/335, paras. 84-92.) F. Internet and social media 45. The Special Rapporteur reiterates his concerns regarding the increasing use of the Internet and social media to promote and disseminate racist content. All opportunities should be taken in order to counter the dissemination of such ideas based on racial superiority or hatred and to promote the principles of respect, non-discrimination, diversity and democracy. The Special Rapporteur would like to recall the States’ obligations under articles 19 and 20 of the International Covenant on Civil and Political Rights. States should adopt measures to counter extremist ideas and biases, while strengthening freedom of expression, which plays a crucial role in promoting democracy and combating racist and xenophobic ideologies. (See A/HRC/26/49, paras. 65-70.) G. Sport 46. The Special Rapporteur would like to emphasize the key role of sports in promoting cultural diversity, tolerance and respect. He would also like to recall paragraph 218 of the Durban Programme of Action, which urges States, in cooperation with the International Olympic Committee, intergovernmental organizations and international and regional sports federations, to intensify the fight against racism in sport by educating the youth of the world through sport practised 8