The noted socialist in question is Eugene V. Debs, an American labor and political leader who ran for president five times as a member of the Socialist Party of America. He was a prominent figure in the early 20th century labor movement and a vocal advocate for workers' rights. Debs was also a strong opponent of US involvement in World War I and was imprisoned for his anti-war activism. His legacy lives on today in the form of the Eugene V. Debs Foundation, which works to promote his ideals of social justice and economic equality.