 He resigned from the Labour Party, in 1938, on account of disagreement with its Foreign Policy.Subsequently, his name was one of twenty-six attached to a letter printed in "The Times" supporting a policy of appeasement towards Germany.Because signatories included Barry Domvile and other leading members it was dubbed "The Link Letter" and its various signatories, including political moderates such as Arnold, William Harbutt Dawson, Smedley Crooke and Lord Londonderry, came under suspicion as far right supporters.