Sean Matgamna

John O'Mahony (Irish: Seán Mac Mathúna; born 1941), better known as Sean Matgamna, is a Trotskyist theorist active in the United Kingdom. A founder of Workers' Fight in 1966, he is still a prominent member of the group, now called the Alliance for Workers' Liberty.

Matgamna was born in 1941 in Ennis, County Clare, Ireland, and grew up in the town, serving as an altar boy at Ennis Cathedral. He emigrated with his family to Manchester in 1954 and attended St Peter's Catholic School in Salford.

He joined the Young Communist League (YCL) as a teenager in Manchester and then, in 1960, Gerry Healy's Trotskyist Socialist Labour League, from which he was expelled in 1963. He joined another Trotskyist group, Militant, in 1965 and in 1966 co-authored a pamphlet, What We Are and What We Must Become outlining his views. When Militant refused to circulate it among the membership, he and his supporters left the organisation.

Matgamna, working with two supporters, formed the Workers' Fight group to act upon his views, central to which was a call for Trotskyist unity in Britain. They began publishing a journal for the Irish Workers Group and a handful of others joined the group before, in 1968, the International Socialists (later the Socialist Workers Party) also put out a call for unity. Responding to it, Workers' Fight joined the IS as the Trotskyist Tendency. With other dockers in Salford, he produced an industrial bulletin, The Hook.

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