John Lincoln Mahon (8 June 1865 – 19 November 1933) was a Scottish trade unionist and politician, best known as a prominent socialist activist.
[4] Mahon sided with William Morris when he seceded with a majority of the SDF executive to form the Socialist League.
[6] With Henry Alfred Barker, he founded the Labour Union, which adopted the programme as its platform, and he served as joint chair of the party until August 1889.
[8] His son, John, was born in 1901, like his father was politically active and became a Communist, standing for election unsuccessfully in the 1949 St Pancras North by-election.
[9] Mahon returned to London in 1904, remaining there for the remainder of his life,[2] although he stood for the Liberal Unionists in the 1906 General Election in the Dublin Harbour constituency taking 872 votes (19.33%) and losing to the Nationalist candidate.