https://en.wikipedia.org/wiki/Eugene_V._Debs
http://www.marxists.org/archive/debs/
In honor of his birthday, Haymarket Books is offering (today only) a 50% discount on Ray Ginger's The Bending Cross, perhaps the best of the many biographies of Debs. See:
http://www.haymarketbooks.org/pb/The-Bending-Cross-A-Biography-of-Eugene-V-Debs Enter the coupon code EDEBS at checkout to purchase the book for only $9.
I highly recommend this book. If you already have a copy it would make a great holiday gift for someone.
Eugene Debs paved the way for breaking free from Wall Street's two-party trap. Debs received almost one-million votes for president while sitting in prison for his outspoken opposition to World War I.