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William "Big Bill" Haywood, a founder of the Industrial Workers of the World, is seen in a long coat and bowler hat as he leads a strike parade in Lowell, Mass., in 1912.
Arthur Caron, second from left, and Charles Plunkett, left of Caron, are seen with other Industrial Workers of the World members in New York.
A bomb exploded at this apartment at 1626 Lexington Ave. in New York City.
Joseph Ettor, a prominent organizer with the IWW, speaks to a group of striking barbers in New York City on May 17, 1913.
Prominent anarchist Alexander Berkman speaks during an Industrial Workers of the World rally on May 1, 1908.
A large number of Industrial Workers of the World members rally in New York on April 11, 1914.
Elizabeth Gurley Flynn was a prominent speaker and organizer in the Industrial Workers of the World.
Industrial Workers of the World members are seen at a rally in New York on May 1, 1912.
The "deportation" of hundreds of Industrial Workers of the World members from Bisbee, Ariz., after a dispute between local copper mines and the union.
IWW organizer Elizabeth Gurley Flynn is seen in a New Jersey courtroom where she was on trial for allegedly giving a speech inciting violence.
A large crowd listens to speakers at an Industrial Workers of the World rally in New York on May 1, 1908.
Two girls are seen wearing "abolish child slavery" banners during a child labor protest in New York City on May 1, 1909. One sign is in Yiddish.
A man wears a hat with with the popular Industrial Workers of the World slogan "Bread or revolution" tucked into the hatband.
This undated photo shows an Industrial Workers of the World rally on Park Row in New York City.
Arthur Caron was killed on July 4, 1914, when a bomb he was building with co-conspirators blew up in a New York City apartment.
Charles Plunkett was a member of the IWW and conspired with others to bomb John D. Rockefeller's house in Tarrytown, N.Y.
Alexander Berkman helped organize the protests to decry the killing of 11 children and two women, along with several striking miners, by the Colorado National Guard at a mine owned by Rockefeller.
Becky Edelsohn was a prominent speaker for the Industrial Workers of the World.
A crowd gathers at Mulberry Park on May 1, 1914, in New York City to show support for Colorado miners.
Hearses carry the bodies of Arthur Caron and others who had plotted to bomb John D. Rockefeller's home in Tarrytown, N.Y.
This dock in Everett, Wash., was the scene of a violent clash.
IWW members on parade in Hibbing, Minn., on June 21, 1916.
A group of prominent radical political figures are seen at the funeral for Arthur Caron and others killed when a bomb exploded in a New York City apartment on July 4, 1914.
Alexander Berkman speaks at an Industrial Workers of the World rally on May 1, 1914.
A group of prominent radical political figures, including Lillian Rubel, Becky Edelsohn, Louise Berger and Alex Berkman, are seen at the funeral for Arthur Caron.
William "Big Bill" Haywood was one of the founders of the Industrial Workers of the World in 1905.
Industrial Workers of the World member Tom Murphy was arrested after a riot in Salt Lake City on Aug. 12, 1913.
The Jan. 1, 1914, edition of The Salt Lake Telegram mentions the Aug. 12, 1913, riot at an IWW rally.
Roy Horton was an Industrial Workers of the World member in Salt Lake City.
This Industrial Workers of the World emblem was burned into the wall of a jail cell in Park City, Utah.
This Industrial Workers of the World emblem was burned into the wall of a jail cell in Park City, Utah.
Coal miners prepare for a clash with the Colorado National Guard.
This 1914 photo shows children and adults posing at Camp Ludlow in south central Colorado.
A slain miner is seen on the ground after the Colorado National Guard attacked striking miners in Ludlow, Colo.
A slain miner is seen on the ground after the Colorado National Guard attacked striking miners in Ludlow, Colo.
People survey damage in the mining camp after the Colorado National Guard attacked striking miners in Ludlow, Colo.
Elizabeth Gurley Flynn, center, and William "Big Bill" Haywood, right, are seen with other prominent IWW figures.
This postcard shows a group of people at the Work People's College in Duluth, Minnesota singing as they prepare to spread the ashes of Joe Hill at the entrance to the school in February 1917.
An account of IWW activities in Utah written by George Child, the head of the Joe Hill Defense Committee.
A group of men pose with a copy of the Industrial Worker, a newspaper that was printed by the Industrial Workers of the World.
A postcard featuring a drawing of prominent Industrial Workers of the World figure Ralph Chaplin.
Wesley Everest was lynched by a mob who took him from a jail cell in Centralia, Wash., on Nov. 11, 1919.
Industrial Workers of the World leader Elizabeth Gurley Flynn speaks to a crowd during the Paterson Silk Strike in New Jersey in 1913.
A portrait of prominent Industrial Workers of the World speaker Elizabeth Gurley Flynn.
William "Big Bill" Haywood on trial after the federal government raided Industrial Workers of the World halls across the country in September 1917.
Industrial Workers of the World prisoners are being led away in handcuffs at an unknown location in 1918.
Frank Little, a prominent Industrial Workers of the World organizer, was killed in Butte, Montana, in 1917.
Police use a fire hose to disperse a crowd on March 10, 1912, during San Diego’s free speech fights.
These men were victims of the violence during free speech fights in San Diego in 1912.
Police use a fire hose on a man on March 10, 1912, during the San Diego free speech fights.
George Prosser was one of the victims of the violence during the free speech fights in San Diego in 1912