Solidarity formerly known as the Anti-Austerity Alliance (AAA) is a socialist political party in the Republic of Ireland, launched in 2014.
 It has been registered as a political party to contest local elections, and ran at least forty candidates in the 2014 Irish local elections.
 This included all of the Socialist Party's sitting councillors, which has led to criticism that Solidarity is a front organisation for the Socialist Party.
 Solidarity denies this, asserting that Solidarity is an alliance of activists and organisations from across the left.
The Youth Party – European Greens (Stranka mladih - Zeleni Evrope , SMS-Zeleni) is a green political party in Slovenia.
 It is led by Igor Jurišič.
 Until July 2009, it was called Youth Party of Slovenia ("Stranka mladih Slovenije", SMS).
The Left (Luxembourgish: "Déi Lénk" , French: "La Gauche" , German: "Die Linken" ) is a democratic socialist political party in Luxembourg.
 The Left was formed on 30 January 1999 by a group of like minded activists, many of them affiliated with existing political parties, notably the Communist Party of Luxembourg (KPL), the New Left, the Revolutionary Socialist Party (RSP), and the Luxembourg Socialist Workers' Party (LSAP).
 One of the aims of this new organisation was to present a further leftist alternative to social democracy.
The Socialist Labor Party (SLP), established in 1876 as the Workingmen's Party, is the oldest socialist political party in the United States and the second oldest socialist party in the world still in existence.
 Originally known as the Workingmen's Party of America, the party changed its name in 1877 to Socialistic Labor Party and again sometime in the late 1880s to Socialist Labor Party.
 The party advocates the ideology of "socialist industrial unionism"—belief in a fundamental transformation of society through the combined political and industrial action of the working class organized in industrial unions.
The Swedish National Socialist Unity Party (Swedish: "Svenska nationalsocialistiska partiet" ) was a National Socialist political party in Sweden.
 The party was born out of a split in the Swedish National Socialist Party in October 1933, as the Göteborg-based Party Staff ("partistaben") of SNSP declared the party leader Birger Furugård expelled from the party.
 Furugård was however able to isolate the Party Staff faction, and retained a majority of the party membership.
 The Party Staff regrouped as the Swedish National Socialist Unity Party (commonly nicknamed "SNSP-staben").
 The Party Staff group continued to publish "Vår Kamp" as its party organ.
The Socialist Party of Romania (Romanian: "Partidul Socialist din România" , commonly known as "Partidul Socialist", PS) was a Romanian socialist political party, created on December 11, 1918 by members of the Social Democratic Party of Romania (PSDR), after the latter emerged from clandestinity.
 Through its PSDR legacy, the PS maintained a close connection with the local labor movement and was symbolically linked to the first local socialist group, the Romanian Social-Democratic Workers' Party.
 Its creation coincided with the establishment of Greater Romania in the wake of World War I; after May 1919, it began a process of fusion with the social democratic groups of in the former territories of Austria-Hungary — the Social Democratic Parties of Transylvania, Banat and Bukovina.
 The parties adopted a common platform in October 1920.
 Progressively influenced by Leninism, the PS became divided between a maximalist majority supporting Bolshevik guidelines and a reformist-minded minority: the former affiliated with the Comintern as the Socialist-Communist Party in May 1921 (officially known as Communist Party of Romania from 1922), while the minority eventually established a new Romanian Social Democratic Party.
The British Socialist Party (BSP) was a Marxist political organisation established in Great Britain in 1911.
 Following a protracted period of factional struggle, in 1916 the party's anti-war forces gained decisive control of the party and saw the defection of its pro-war Right Wing.
 After the victory of the Bolshevik Revolution in Russia at the end of 1917 and the termination of World War I the following year, the BSP emerged as an explicitly revolutionary socialist organisation.
 It negotiated with other radical groups in an effort to establish a unified communist organisation, an effort which culminated in August 1920 with the establishment of the Communist Party of Great Britain.
 The youth organisation the Young Socialist League was affiliated with the party.
The Socialist People's Party (Danish: "Socialistisk Folkeparti" , SF) is a green and popular socialist political party in Denmark.
The Socialist Party of Connecticut (SPCT) is a socialist political party in the U.S. state of Connecticut.
 Founded as an affiliate of the Socialist Party of America, the party split with the SPA in 1936 and joined the Social Democratic Federation.
 In 1957, the Social Democratic Federation reunified with the Socialist Party of America.
 In 1973, the SPA voted to reform and rename itself Social Democrats, USA, which sought to reform the Democratic Party.
 The current Socialist Party of Connecticut is the state chapter of the Socialist Party USA.
Socialistisk Folkepartis Ungdom (Youth of the Socialist People's Party) is the youth wing of the Socialist People's Party of Denmark, founded in 1969.
 In 2008 it became the biggest youth party political organisation in Denmark.

Question: Which socialist political party in Denmark became the biggest youth party political organisation in 2008?
Answer: Socialist People's Party