In 1973, Haigh became a district secretary for the NUDBTW, and in 1977, he was appointed as its National Organiser, also leading on negotiations on pay and conditions for members. In 1979, he was elected as the union's Assistant General Secretary, but the NUDBTW decided to merge into the Transport and General Workers' Union (TGWU) in 1982. He was appointed as secretary of the TGWU's new dyers, bleacher and textile workers group,[1] and was also elected to the General Council of the Trades Union Congress (TUC), although he served only one year before it was reorganised. The TUC decided that the textile workers could no longer be represented separately from the rest of the TGWU, and Haigh therefore left the council.[2]
From 1982 until 1991, Haigh served on the National Executive Committee of the Labour Party.[1] He was loosely associated with the party's left wing, although he voted for the expulsion of the committee of Militant.[3] He chaired the party's important Finance and General Purposes Committee from 1986,[4] In 1992, he chaired the party's annual conference.[5]
In 1985, Haigh was appointed as Assistant General Secretary of the TGWU, serving until he took early retirement, in 1991.[1][6]