Such execution was carried out on the grounds that German blood should not support non-Germanic people,[3] and that killing them would deprive foreign nations of superior leaders.[4] The intelligenzaktion was justified, even though these elites were regarded as likely to be of German blood, because such blood enabled them to provide leadership for the fatalistic Slavs.[29] Germanising "racially valuable" elements would prevent any increase in the Polish intelligenstia,[27] as the dynamic leadership would have to come from German blood.[30] In 1940 Hitler made it clear that the Czech intelligentsia and the "mongoloid" types of the Czech population were not to be Germanised.[31]