United Socialist Party - UK - was created in 2004.
United Socialist Workers' Party was created in 1993.
World Socialist Party of the United States was created in 1916.
Scottish Socialist Party United Left was created in 2006.
Socialist Equality Party - United States - was created in 1966.
United Jewish Socialist Workers Party was created in 1917.
Socialist Workers Party - United States - was created in 1938.
Freedom Socialist Party was created in 1966.
Burma Socialist Party was created in 1945.
Nicaraguan Socialist Party was created in 1944.
Belgian Socialist Party was created in 1945.
Yemeni Socialist Party was created in 1978.