Morrison became in 1936 one of the first women members of the
Peace Pledge Union (PPU), a British pacifist organisation, and the British section of
War Resisters International (WRI). She served as a campaign organiser and chair and wrote the first history of the PPU. In 1940, she spent a month in
Holloway Prison for having spoken against the war at London's
Speakers' Corner. Sybil Morrison was the secretary of the short-lived Women's Peace Campaign, set up by the PPU at the end of 1939. It had been hoped to obtain the signatures of one million women against the Second World War, but as Morrison admitted, "The invasion of Scandinavia has, of course, made it much more difficult now to approach people about signing an appeal for negotiations because opinion is hardening against the pacifist. The Campaign was doomed after the surrender of the French in June, 1940 but the collapse may also have had something to do with the opposition of
John Middleton Murry, editor of
Peace News. Murry was described as having a "frightful" attitude towards women and was not at all supportive of the campaign". Morrison was the organising secretary and chair of the
Six Point Group (–1950). It campaigned for legislation on assault against children, on support for widows, on legislation in support of unmarried mothers and on issues of equal rights and equal pay. Another member of the group was
Dora Russell, the second wife of
Bertrand Russell. She was also chair of the British branch of the
Women's International League for Peace and Freedom. Morrison was also active with the
Howard League for Penal Reform and the
National Peace Council. She was a vice-president of the
Fellowship Party, a small British political party that attracted many peace activists. She was a close friend of the leading peace activists
Donald Soper and
Fenner Brockway and the pacifist actress
Sybil Thorndike; they each referred to "the other Sybil". She was a
lesbian who was once described as "the most famous dyke in London". Other people with whom Morrison worked included
Vera Brittain,
Alex Comfort,
Laurence Housman,
Hugh Brock and
Kathleen Lonsdale and many other leading individuals in radical politics during much of the 20th century. Even towards the end of her life, she took an active interest in politics and turned up at the beginning of a march against the
Falklands War. ==Oral History==