To mark the centenary of its first publication in 1848, the Labour Party issued this important special edition of the Communist Manifesto. In his (then) new historical introduction, Harold Laski discussed the authors of the Manifesto, their background and the development of their ideas. He outlined the history of the CommunistLeague, the struggles of the different sects and the emergence of Marx as a leader mandated to produce a programme. After surveying the genesis of the Manifesto, Laski discusses its contribution to world thought.