"The Ku Klux Klan is a racist organization."  
 "The Ku Klux Klan is an organization that has advocated white supremacy and anti-Semitism."  

 Can you see the difference? in the first example the Ku Klux Klan has been labelled Racist whereas in the second example they haven't been labelled racist as such, but rather, the statement establishes what makes them racist; without using the labelling word. Even though there is a consensus that the Ku Klux Klan is a racist organisation, it is still not wise to simply say "the Ku Klux Klan is a racist oraganisation" as it is contrary to WP:LABEL. 

 In fact it doesn't say anywhere in the article that the BNP is "Extreme" for it to be classed as "less extreme" later on in the article. Maybe controversial is not the best word to use, but surly there is a better one than "extreme". Perhaps something like "Since Griffin took over its leadership, the BNP has adapted policies slightly closer to the mainstream, promoting similar policies to the Euronationalist approach"