‘The Labour Party is a democratic socialist party. It believes that by the strength of our common endeavour we achieve more than we achieve alone, so as to create for each of us the means to realise our true potential and for all of us a community in which power, wealth and opportunity are in the hands of the many, not the few. Where the rights we enjoy reflect the duties we owe. And where we live together, freely, in a spirit of solidarity, tolerance and respect.’
Clause 4 of the Labour Party constitution
The Labour Party was set up in 1900 to fight for representation for the Labour movement - trade unions and socialist societies - in Parliament.
Its first leader was Keir Hardie, one of the earliest Labour MPs.
http://www.labour.org.uk/aboutlabour/ Strange that Keir Hardie's real opinions should be so little known by British socialists. We have before us a pamphlet containing reprints of three articles written by Keir Hardie in 1910, and entitled: Karl Marx: The Man and His Message. This pamphlet shows how absurd are the stories that Keir Hardie ignored or was opposed to the Marxian doctrine, or, as we have sometimes seen it said, he had never read a line of Marx. The fact is that Keir Hardie was much too big a man to make a parade of knowledge. But here are some extracts from Keir Hardie's pamphlet:
http://archive.workersliberty.org.uk/wlmags/wl62/hardie.htm