ANC rules and Mbeki's commitment to the idea of party discipline mean that he may not publicly criticise the current government policy that HIV causes AIDS and that antiretrovirals should be provided. Some critics of Mbeki continued to assert that notwithstanding he continued to influence AIDS policy through his personal views behind the scenes, a charge which his office regularly denies. However, in a 2007 published biography "Thabo Mbeki: The Dream Deferred", author Mark Gevisser describes how the president, knowing that he was writing the biography, contacted him earlier in 2007. This was to ask whether the author had seen a 100-page paper secretly authored by Mr. Mbeki and distributed anonymously among the ANC leadership six years ago. This paper compared orthodox AIDS scientists to latter-day Nazi concentration camp doctors and portrayed black people who accepted orthodox AIDS science as "self-repressed" victims of a slave mentality. It described the "HIV/AIDS thesis" as entrenched in "centuries-old white racist beliefs and concepts about Africans". In the published biography Mr Gevisser describes the president's view of the disease as apparently shaped by an obsession with race, the legacy of colonialism and "sexual shame".