William Dudley "Big Bill" Haywood (February 4, 1869 – May 18, 1928) 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.