also promoted eugenics, calling for the improvement of the quality as well as the quantity of the white British people. Under Tyndall, it called for the sterilisation of those with genetically transmittable disabilities. By 2011, the party's website was utilising the Fourteen Words slogan: "We must secure the existence of our people and a future for white children." White supremacism A white supremacist party, the NF rejected the concept of racial equality. It argued that different races can be ranked hierarchically based on differing abilities, and that the "higher races" compete for world domination. It believed that racial segregation was natural and ordained by God, but that non-whites had been encouraged to migrate to Britain and other white-majority countries to breed with the indigenous inhabitants and thus bring about "white genocide" through assimilation. It opposed inter-racial marriage and miscegenation—typically referring to the latter as "mongrelisation"—and displayed particular anxiety about black men seducing white women. It claimed its racial prejudice arose from a natural desire for racial preservation rather than hatred of other races. The NF claimed that most non-white racial groups were inferior to "Caucasoids and Mongoloids". In the mid-1970s, Tyndall used Spearhead to claim that "the negro has a smaller brain and a much less complex cerebral structure" than whites; in the early 1980s, Nationalism Today carried articles maintaining that black Africans had lower average IQs than whites and thus were unfit "to go to white schools" or "live in white society". Its published material presented black people as dirty and unhygienic, infected with disease and incapable of governing themselves. Spearhead featured references to black people being cannibals; at least one article claimed they ate dirt and faeces. The NF sought academic support for its views, placing great importance on scientific racist publications. Its booklist offered academic and quasi-academic books endorsing scientific racism; early party literature often referenced the work of Hans Eysenck, William Shockley, Arthur Jensen and Richard Herrnstein, while Spearhead and other NF publications repeatedly cited articles from the Mankind Quarterly. In citing these studies, the party claimed that its views were scientific, although Fielding observed that the NF's racial views relied "as much on blind assertion, on faith, as on 'scientific' sources". Anti-immigrationism and repatriation The cornerstone of the Front's manifesto since 1974 has been the compulsory deportation of all non-white immigrants and their descendants, as well as the white British partners in mixed-race relationships. It