While the theory is formally shared by most currents that identify positively with Lenin, including the Communist International, few organizations place the theory at the center of their work. The term is most widely used in the United States, where it was popularized in the decade prior to the First World War by Eugene Debs's Socialist Party of America, and the Industrial Workers of the World (see below). In Britain those who hold to this theory include the Communist Party of Great Britain (Marxist-Leninist) and the Revolutionary Communist Group.