Labor federation competition in the United States is a history of the labor movement, considering U.S. labor organizations and federations that have been regional, national, or international in scope, and that have united organizations of disparate groups of workers. Union philosophy and ideology changed from one period to another, conflicting at times. Government actions have controlled, or legislated against particular industrial actions or labor entities, resulting in the diminishing of one labor federation entity or the advance of another.

William Dudley Haywood, nicknamed "Big Bill", was an American labor organizer and founding member and leader of the Industrial Workers of the World (IWW) and a member of the executive committee of the Socialist Party of America. During the first two decades of the 20th century, Haywood was involved in several important labor battles, including the Colorado Labor Wars, the Lawrence Textile Strike, and other textile strikes in Massachusetts and New Jersey.