1st Congress, 1898 | 2nd Congress, 1903 | 3rd Congress, 1905 | 4th Congress, 1906 | 5th Congress, 1907 | 6th Congress, 1917 | 7th Congress, 1918 | 8th Congress, 1919 | 9th Congress, 1920 | 10th Congress, 1921 | 11th Congress, 1922 | 12th Congress, 1923 | 13th Congress, 1924 | 14th Congress, 1925 | 15th Congress, 1927 | 16th Congress, 1930 | 17th Congress, 1934 | 18th Congress, 1939 | 19th Congress, 1952 | 20th Congress, 1956 | 21st Congress, 1959 | 22nd Congress, 1961 | 23rd Congress, 1966 | 24th Congress, 1971 | 25th Congress, 1976 | 26th Congress, 1981 | 27th Congress, 1986 | 28th Congress, 1990  The 1st Congress of the RSDLP (Russian Social Democratic Labor Party, RSDLP) was held between March 14-16 ([March 1-3, O.S.) 1898 in Minsk, Russian Empire (now Belarus) in secrecy in a private house on the outskirts of Minsk (now in the town centre). ... The 2nd Congress of the RSDLP (Russian Social Democratic Labor Party) was held during July 30 - August 23 (July 17 - August 10, O.S.), 1903, starting in Brussels, Belgium (until August 6) and ending in London, because Belgian police forced the delegates to leave the country. ... The 20th Congress of the Communist Party of the Soviet Union was held during February 14—February 26, 1956. ... This article or section does not cite its references or sources. ... 28th Congress of the CPSU (July 2, 1990—July 13, 1990) was held in Moscow. ...