Derek Hatton (born 1948 in Liverpool), is a politician in England. Hatton was a member of the Labour Party and the high-profile deputy leader of Liverpool City Council in the 1980s. He was expelled in 1986 for belonging to the Militant Tendency, an entryist faction in the Labour Party promoting Trotskyism. The National Executive Committee of the party voted to expel him by 12 votes to 6, the move being a policy aim of Neil Kinnock. Hatton's name become synonymous with the left-wing grouping believed by many to have ruined Labour's chances of electoral success under Kinnock.