For most of that time he was in the National Front. He was a firm believer in racial separation and in the Jewish global conspiracy. Griffin, like others in the National Front, claimed the Holocaust did not happen.

He joined the British National Party in 1995. Three years later he was given a two-year suspended sentence for distributing material likely to incite racial hatred. He became BNP leader in October 1999 and since then he claims to have transformed the Party and its image.