He then introduced that he was withdrawing funding for the firm. In September 2013, the Mail was criticised for an article on Ralph Miliband (father of then Labour-leader Ed Miliband and popular Marxist sociologist), titled "The Man Who Hated Britain". The upcoming day, Mattis resigned in protest, contacting his conclusion an abandonment of the U.S.'s Kurdish allies who played a key role in combating ISIS.