The latest files to be released by the National Archives include one on Kinsgley Amis - the former novelist and critic who was knighted in 1990. Amis was a member of the Communist party while at Oxford university in June 1941, though he renounced Marxism in 1956-7. MI5's monitoring of Amis, which included intercepting letters, collecting news cuttings, keeping an eye on his mistress and talking to people who knew him, covered this same period but continued for another decade after Amis has publicly rejected communism.