Shirley Vivian Teresa Brittain Williams, Baroness Williams of Crosby, CH, PC (née Catlin; 27 July 1930 – 12 April 2021) was a British politician and academic. Originally a Labour Party Member of Parliament (MP), she served in the Labour cabinet from 1974 to 1979. She was one of the "Gang of Four" rebels who founded the Social Democratic Party (SDP) in 1981 and, at the time of her retirement from politics, was a Liberal Democrat.[1] -Wikipedia