The Socialist Party of America (SPA) was a democratic socialist and social democratic political party in the United States formed in 1901 by a merger between the three-year-old Social Democratic Party of America and disaffected elements of the Socialist Labor Party of America which had split from the main organization in 1899.
The Social Democratic Party of America (SDP) was a short-lived political party in the United States established in 1898.
Martin "Marty" Abern (1898–1949) was a Marxist politician who was an important leader of the Communist youth movement of the 1920s as well as a founder of the American Trotskyist movement.
The Communist Labor Party of America (CLPA) was one of the organizational predecessors of the Communist Party USA.
William Z. Foster was a radical American labor organizer and Marxist politician, whose career included serving as General Secretary of the Communist Party USA from 1945 to 1957. He was previously a member of the Socialist Party of America and the Industrial Workers of the World, leading the drive to organize the packinghouse industry during World War I and the steel strike of 1919.
Charles Emil Ruthenberg was an American Marxist politician and a founder and head of the Communist Party USA (CPUSA).
Socialist Alternative (SA) is a Trotskyist political party in the United States. It describes itself as "a national organization fighting in our workplaces, communities, and campuses against the exploitation and injustices people face every day" and "a community of activists fighting against budget cuts in public services; fighting for living wage jobs and militant, democratic unions; and people of all colors speaking out against racism and attacks on immigrants, students organizing against tuition hikes and war, women and men fighting sexism and homophobia".
The Socialist Party of Oregon (SPO) is the name of three closely related organizations — an Oregon state affiliate of the Social Democratic Party of America established in 1897 and continuing into the 1950s, as well as the Oregon state affiliate of the Socialist Party USA from 1992 to 1999.
Alfred Wagenknecht was an American Marxist activist and political functionary. He is best remembered for having played a critical role in the establishment of the American Communist Party in 1919 as a leader of the Left Wing Section of the Socialist Party. Wagenknecht served as Executive Secretary of the Communist Labor Party of America and the United Communist Party of America in 1919 and 1920, respectively.
The Finnish Socialist Federation was a language federation of the Socialist Party of America which united Finnish language-speaking immigrants in the United States in a national organization designed to conduct propaganda and education for socialism among their community.
The Social Democracy of America (SDA), later known as the Cooperative Brotherhood, was a short lived political party in the United States that sought to combine the planting of an intentional community with political action in order to create a socialist society. It was an organizational forerunner of both the Socialist Party of America (SPA) and the Burley, Washington cooperative socialist colony.
The Agricultural Workers Organization (AWO), an organization of farm workers throughout the United States and Canada, was formed on April 15, 1915, in Kansas City. It was supported by, and a subsidiary organization of, the Industrial Workers of the World (IWW). Although the IWW had advocated the abolition of the wage system as an ultimate goal since its own formation ten years earlier, the AWO's founding convention sought rather to address immediate needs, and championed a ten-hour work day, premium pay for overtime, a minimum wage, good food and bedding for workers. In 1917 the organization changed names to the Agricultural Workers Industrial Union (AWIU) as part of a broader reorganization of IWW industrial unions.
The Socialist Party of Washington was the Washington state section of the Socialist Party of America (SPA), an organization originally established as a federation of semi-autonomous state organizations.
Hermon Franklin Titus (1852–1931) was an American socialist activist and newspaper publisher. Originally a Baptist minister before becoming a medical doctor, Titus is best remembered as a factional leader of the Washington state affiliate of the Socialist Party of America (SPA) during the first decade of the 20th century and as editor of The Socialist, one of the most-widely circulated radical newspapers of that period. Titus led a party split from the Socialist Party of Washington in 1909 and helped found a short-lived organization called the Wage Workers Party. His paper failed with that organization and he died in self-chosen obscurity in New York City, a medical doctor working in a low paying service job.
Erwin Bratton "Harry" Ault (1883–1961) was an American socialist and trade union activist. He is best remembered as the editor of the Seattle Union Record, the long-running labor weekly published from 1912 to 1928. After termination of the Union Record, Ault worked as a commercial printer for a number of years, before being appointed a deputy U.S. Marshal for Tacoma, Washington, a position which he retained for 15 years.
Walter Thomas Mills (1856–1942) was an American socialist activist, educator, lecturer, writer, and newspaper publisher. He is best remembered for the role he played in the Socialist Party of America during the first decade of the 20th Century as one of the leaders of the organization's moderate wing. He also was a key actor in the labor movement of New Zealand as a founder of the United Labour Party in 1912. He returned to the United States in 1914 with the advent of World War I and worked unsuccessfully to keep the country out of the bloody European conflict, eventually leaving the socialist movement in the 1920s.
George Ellsworth Boomer (1862–1915) was an American socialist journalist, newspaper editor, and political activist. Boomer is best remembered as a key participant in the formation of the Socialist Party of Washington and as its candidate for the Governor of Washington in 1908.
The Spartacist League is a Trotskyist political grouping. They are the United States section of the International Communist League, formerly the International Spartacist Tendency. This Spartacist League named themselves after the original Spartacus League of Weimar Republic in Germany, but the current League has no formal descent from it. The League self-identifies as a "revolutionary communist" organization.
The International Socialist Organization (ISO) was an American Marxist group that was founded in 1977 and dissolved in 2019. The organization held Leninist positions on imperialism and the role of a vanguard party. However, it did not believe that necessary conditions for a revolutionary party in the United States were met; ISO believed that it was preparing the ground for such a party. The organization held a Trotskyist critique of nominally socialist states, which it considered class societies. In contrast, the organization advocated the tradition of "socialism from below." Initially founded as a section of the International Socialist Tendency, it was strongly influenced by the perspectives of Hal Draper and Tony Cliff. It broke from the IST in 2001, but continued to exist as an independent organization for the next eighteen years. The organization advocated independence from the U.S. two-party system but sometimes supported electoral strategies by outside parties.
The Socialist Workers Party (SWP) is known as a communist party in the United States. Originally a group in the Communist Party USA that supported Leon Trotsky against Soviet leader Joseph Stalin, it places a priority on "solidarity work" to aid strikes and is strongly supportive of Cuba. The SWP publishes The Militant, a weekly newspaper that dates back to 1928. It also maintains Pathfinder Press.