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Headshot studio portrait of American socialist activist and labor leader Eugene V. Debs (1855 - 1926), 1890s. (Photo by Hulton Archive/Getty Images)

Headshot studio portrait of American socialist activist and labor leader Eugene V. Debs (1855 - 1926), 1890s. (Photo by Hulton Archive/Getty Images)

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1912: Socialist party presidential candidate Eugene Victor Debs (1855 - 1926) addressing a political meeting in New York. Debs was the socialist candidate five times and fought his last presidential campaign from a prison cell after his arrest for sedition during World War I. (Photo by Keystone/Getty Images)

1912:  Socialist party presidential candidate Eugene Victor Debs (1855 - 1926) addressing a political meeting in New York. Debs was the socialist candidate five times and fought his last presidential campaign from a prison cell after his arrest for sedition during World War I.  (Photo by Keystone/Getty Images)

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American socialist activist and labor leader Eugene Debs (R) (1855 - 1926) poses with Victor Berger of Wisconsin and Berth Hale White of Arkansas during the meeting of the National Executive Committee of the Socialist Party, at the New Hamilton Hotel, Washington, D.C., early 1920s. (Photo by New York Times Co./Getty Images)

American socialist activist and labor leader Eugene Debs (R) (1855 - 1926) poses with Victor Berger of Wisconsin and Berth Hale White of Arkansas during the meeting of the National Executive Committee of the Socialist Party, at the New Hamilton Hotel, Washington, D.C., early 1920s. (Photo by New York Times Co./Getty Images)

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Eugene Debs addresses a crowd of people, circa 1910. (Photo by Fotosearch/Getty Images).

Eugene Debs addresses a crowd of people, circa 1910. (Photo by Fotosearch/Getty Images).

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American labor leader and prominent socialist Eugene V. Debs (1855 - 1926), US Presidential candidate from the Socialist Party, speaks to supporters during his campaign, 1908. This was his third (of five) campaigns for president.. (Photo by PhotoQuest/Getty Images)

American labor leader and prominent socialist Eugene V. Debs (1855 - 1926), US Presidential candidate from the Socialist Party, speaks to supporters during his campaign, 1908. This was his third (of five) campaigns for president.. (Photo by PhotoQuest/Getty Images)