Labour Party 
noun
A left-of-centre political party formed to represent the interests of ordinary working people, in particular a major British party that since the Second World War has been in power 1945–51, 1964–70, 1974-9, and 1997–2010. Arising from the trade union movement at the end of the 19th century, it replaced the Liberals as the country’s second party after the First World War.