Republican Party (United States)
Founded in 1854, the GOP originally subscribed to classical liberalism and took ideological stands that were anti-slavery and pro-economic reform. Abraham Lincoln was the first Republican president in the history of the United States. The party was usually dominant over the Democrats during the Third Party System and Fourth Party System. In 1912, Theodore Roosevelt formed the Progressive ("Bull Moose") Party after being rejected by the GOP and ran as a third-party presidential candidate. Roosevelt called for many social reforms, some of which were later championed by New Deal Democrats in the 1930s. He lost the 1912 election, and when most of his supporters returned to the GOP, they were at odds with the party's new conservative economic stance; many left for the Democratic Party, and an ideological shift to the right occurred in the Republican Party. Later in the 20th century, the liberal Republican element was overwhelmed by a conservative surge begun by Barry Goldwater in 1964 and continued during the Reagan Era.
Communist Party of the Soviet Union
The Communist Party of the Soviet Union (CPSU) was the founding and ruling political party of the Soviet Union. The CPSU was the sole governing party of the Soviet Union until 1990, when the Congress of People's Deputies modified Article 6 of the most recent 1977 Soviet constitution, which had granted the CPSU a monopoly over the political system. The party was founded in 1912 by the Bolsheviks (a majority faction of the Russian Social Democratic Labour Party, RSDLP), led by Vladimir Lenin, which seized power in the October Revolution, the second of the Russian Revolutions of 1917.