Returning to Britain in 1910, Mann wrote "The Way to Win", a pamphlet that argued that socialism could be achieved only through trade unionism and co-operation, and that parliamentary democracy was inherently corrupt. He founded the Industrial Syndicalist Education League, and worked as an organiser for Ben Tillett. He led the 1911 Liverpool General Transport Strike. In 1912 he was convicted under the Incitement to Mutiny Act 1797 of publishing an article in "The Syndicalist", as an "Open Letter to British Soldiers", urging them to refuse to shoot at strikers (later reprinted as a leaflet, "Don't Shoot"); his prison sentence was quashed after public pressure. He was opposed to Britain's involvement in World War I on socialist and religious grounds and addressed pacifist rallies.