Question: Which faction of the Marxist Russian Social Democratic Labour Party did Nikolai Krivoruchko join?

Context paragraphs:
Social Democratic Labour Party of Norway: The Social Democratic Labour Party of Norway (in Norwegian "Norges Socialdemokratiske Arbeiderparti") was a Norwegian political party in the 1920s.  Following the Labour Party's entry into the Comintern in 1919 its right wing left the party to form the Social Democratic Labour Party in 1921.  At the party convention in 1923, however, the Labour Party withdrew from Comintern, and the Communist Party of Norway was formed by the minority, who continued its affiliation with Comintern and the Soviet Union until 1991.  The Social Democratic Labour Party was absorbed into the reorganised Labour Party in 1927.

Yakov Zevin: Yakov Davidovich Zevin (1888–1918) was a Jewish Communist activist, one of the Bolshevik Party leaders in Azerbaijan during the Russian Revolution.  Zevin was born in Krasnapolle, a town in nowadays Mahilyow Voblast, Belarus.  He became a member of Russian Social Democratic Labour Party in 1904 and he was arrested several times for conducting revolutionary activities.  He was a delegate in the 6th (Prague) conference of the Russian Social Democratic Labour Party in 1912, where he represented the group of Mensheviks.  After the conference he became close to the Bolshevik positions.  In 1915 he was a member of the Baku committee of Bolsheviks.  After the February Revolution of 1917 he worked in the Moscow council of working deputies.  Zevin became one of the 26 Baku Commissars (he was the Commissar of Labor) of the Soviet Commune that was established in the city after the October Revolution.  When the Commune was toppled by the Centro Caspian Dictatorship, a British-backed coalition of Dashnaks, SRs and Mensheviks, Zevin and his comrades were captured by British troops and executed by a firing squad between the stations of Pereval and Akhcha-Kuyma of Transcaucasian Railroad.

Leon Trotsky: Leon Trotsky ( ;; also transliterated "Lyev", "Trotski", "Trotskij", "Trockij" and "Trotzky".  born Lev Davidovich Bronstein; 7 November 1879 – 21 August 1940) was a Marxist revolutionary, theorist, and Soviet politician.  Initially supporting the Menshevik Internationalists faction within the Russian Social Democratic Labour Party, he joined the Bolsheviks ("majority") just before the 1917 October Revolution, immediately becoming a leader within the Communist Party.  He would go on to become one of the seven members of the first Politburo, founded in 1917 to manage the Bolshevik Revolution.  During the early days of the Russian Soviet Federative Socialist Republic (RSFSR) and the Soviet Union, he served first as People's Commissar for Foreign Affairs and later as the founder and commander of the Red Army, with the title of People's Commissar of Military and Naval Affairs.  He became a major figure in the Bolshevik victory in the Russian Civil War (1918–1923).

Nikolai Krivoruchko: Nikolai Nikolayevich Krivoruchko (Russian, Николай Николаевич Криворучко, December 6, 1887 – August 19, 1938) was a Soviet Komkor (corps commander).  He fought in the Imperial Russian Army in World War I before going over to the Bolsheviks during the subsequent civil war.  He was a recipient of the Order of Lenin and the Order of the Red Banner.  During the Great Purge, he was arrested on February 21, 1938 and later executed.

Mensheviks: The Mensheviks (sometimes called Menshevists Russian: меньшевик ) were a faction of the Russian socialist movement that emerged in 1904 after a dispute in the Russian Social Democratic Labour Party (RSDLP) between Julius Martov and Vladimir Lenin, leading to the party splitting into two factions, one being the Mensheviks and the other being the Bolsheviks.  The dispute originated at the Second Congress of the RSDLP, ostensibly over minor issues of party organization.  Martov's supporters, who were in the minority in a crucial vote on the question of party membership, came to be called "Mensheviks", derived from the Russian word меньшинство ("minority"), whereas Lenin's adherents were known as "Bolsheviks", from большинство ("majority").  Neither side held a consistent majority over the course of the congress.  The split proved to be long-standing and had to do both with pragmatic issues based in history, such as the failed revolution of 1905, and theoretical issues of class leadership, class alliances, and interpretations of historical materialism.  While both factions believed that a proletariat revolution was necessary, the Mensheviks generally tended to be more moderate and were more positive towards the liberal opposition and the dominant peasant-based Socialist Revolutionary party.

Russian Social Democratic Labour Party: The Russian Social Democratic Labour Party (RSDLP; Russian: Росси́йская социа́л-демократи́ческая рабо́чая па́ртия (РСДРП) , "Rossiyskaya sotsial-demokraticheskaya rabochaya partiya (RSDRP)"), also known as the Russian Social Democratic Workers' Party or the Russian Social Democratic Party, was a revolutionary socialist political party formed in 1898 in Minsk to unite the various revolutionary organizations of the Russian Empire into one party.  The RSDLP later split into "Majority" and "Minority" factions, with the Majority (in Russian: ""Bolshevik"") faction eventually becoming the Communist Party of the Soviet Union.  The "Interdistrictites" were also formed from this party.

Social Democratic Party of Georgia: The Social Democratic Party of Georgia (Georgian: საქართველოს სოციალ-დემოკრატიული პარტია, "sakartvelos sotsial-demok'rat'iuli p'art'ia" ), also known as the Georgian Menshevik Party, was Georgian Marxist, and later, a social democratic political party.  It was founded in the 1890s by Nikolay Chkheidze, Silibistro Jibladze, Egnate Ninoshvili, Noe Zhordania and others.  It became the Georgian branch of the Russian Social Democratic Labour Party.  After 1905, Georgian social democrats joined the Menshevik faction, except for some such as Joseph Stalin, Grigol Ordzhonikidze and Makharadze.  Several leaders were elected to the Russian Duma from Kutais or Tifli: Nikolay Chkheidze, Akaki Chkhenkeli, Evgeni Gegechkori, Isidore Ramishvili, Irakly Tsereteli, Noe Zhordania.

Prague Conference: The Prague Conference, officially the 6th All-Russian Conference of the Russian Social Democratic Labour Party, was held in Prague, Austria-Hungary on 5–17 January 1912.  Eighteen Bolsheviks attended, although Joseph Stalin and Yakov Sverdlov, who were in exile at the time, were not able to.  Georgi Plekhanov claimed he was too ill to attend.  At the conference, Vladimir Lenin and his supporters broke away from the rest of the Russian Social Democratic Labour Party and formed their own, Russian Social Democratic Labour Party (bolsheviks).  The conference was meant to be secret; Lenin had instructed: "No-one, no organisation must know about this".  However, every detail was known to the Okhrana, the secret police of the Russian Empire.

Vpered: Vpered ("Forward" or "Hasten") (1909 - 1912) was an organization emanating from within the Russian Social Democratic Labour Party (Russian Social Democracy or RSDLP).  The faction was gathered by Alexander Bogdanov (1873 - 1928) in December 1909.  The group included: Alexander Bogdanov, Maxim Gorky, Anatoly Lunacharsky, Mikhail Pokrovsky, Grigory Aleksinsky, Stanislav Volski, and Martyn Liadov.  Although Vpered emerged from the Bolshevik wing of Russian Social Democracy, the group was critical of Lenin.

Bolsheviks: The Bolsheviks, originally also Bolshevists or Bolsheviki (Russian: большевики, большевик (singular) ; ] ; derived from большинство "bol'shinstvo", "majority", literally meaning "one of the majority") were a faction of the Marxist Russian Social Democratic Labour Party (RSDLP) which split apart from the Menshevik faction at the Second Party Congress in 1903.  The RSDLP was a revolutionary socialist political party formed in 1898 in Minsk in Belarus to unite the various revolutionary organisations of the Russian Empire into one party.

Supporting paragraphs: Nikolai Krivoruchko Bolsheviks
Answer: Bolsheviks