[2] In 1985, Massiter, who as an MI5 officer had been responsible for the surveillance of CND from 1981 to 1983, resigned and made disclosures to a Channel 4 20/20 Vision programme, "MI5's Official Secrets".
[3][4] She said that her work was determined more by the political importance of CND than by any security threat posed by subversive elements within it, and argued that the organisation was contravening the rules governing its practices.
[5] In 1983, she analysed telephone intercepts on John Cox that gave her access to conversations with Joan Ruddock and Bruce Kent.
[6] CND activist Pat Arrowsmith, who had known Newton for twenty-five years, disputed the veracity of Massiter's allegations against him.
Massiter also revealed the surveillance of Harriet Harman and Patricia Hewitt, who had respectively held the posts of the legal officer and general secretary of the National Council for Civil Liberties.