Bryer joined the
Women's Social and Political Union (WSPU) and the
Church League for Women's Suffrage (CLWS), abandoning her career as a musician to campaign for
women's rights. She seems to have come from a musical family for her relative George Bryer was a member of one of the fife and drum bands which took part in the procession for the
WSPU's 'Women's Sunday' in June 1908 Between 1911 and 1913 Constance Bryer was the Secretary for the North Islington branch of the WSPU. She was involved in '
Black Friday' in 1910 and was arrested for obstruction but was later discharged. She illegally 'evaded' the 1911 census survey by not being present at her family home at 49 Tuffnell Park Road in London when officials called to record information. In 1911, Bryer was arrested when taking part in a WSPU demonstration against the 'torpedoing' of the
Conciliation Bill and for which she was sentenced to five days in prison. in the 1920s In May 1912 Bryer was sentenced to four months in
HM Prison Birmingham for breaking windows on
Regent Street in London. In prison with her was
Olive Wharry, who became her lifelong friend. While on
hunger strike there with other suffragette prisoners Bryer wrote a verse and signed her name in an autograph album: Suffragettes we sit and sew Sew and sit and sit and sew Twenty-five are we: Making shirts and socks for men Cannot get away from them Even here you see. ==Later life and death==