Vladimir Lenin was the leader of the Bolshevik faction of the Russian Social Democratic Labor Party in Russia. That faction later split off and became its own party. Then in March 1918 it changed its name to the Communist Party. Lenin led the Bolshevik faction of the Marxist Russian Social Democratic Party. Eventually the faction split from the RSDP to become the Bolshevik Party. After the Russian Civil War, it became the Communist Party.
Social Democratic Party which is the oldest political party in Germany; the Christian Democratic Union; the Christian Social Party, which is the sister party of the CDU and is confined to Bavaria; the Greens; the far-rightist, The National Party; and the "new" Communist party of Germany.
Trotsky was first associated with the Menshevik faction of the Marxist Russian Social Democratic Labor Party, then the Bolshevik Party and lastly the Communist Party.
Vladimir Lenin was the leader of the radical faction of the Russian Socialist Democratic Labor Party known as the Bolshevik Party. In March 1918, they changed their name to the Communist Party.
Yugoslav Social-Democratic Party was created in 1896.
Nationwide Social Democratic Party was created in 2006.
Social Democratic Party of Slovakia was created in 1990.
Social-Democratic Party of Wisconsin was created in 1897.
Social-Democratic Party of Wisconsin ended in 1972.
Social Democratic Party of India was created in 2009.
Social Democratic Party 'Harmony' was created in 2010.
Social Democratic Party - Romania - was created in 1992.