Question: The organization that was trying to make Ireland socialist lost members who disagreed with them to form what movement?

Context paragraphs:
Armalite and ballot box strategy: The Armalite and ballot box strategy was a strategy pursued by the Irish republican movement in the 1980s and early 1990s in which elections in Northern Ireland and the Republic of Ireland were contested by Sinn Féin, while the IRA continued to pursue an armed struggle against the British Army, the Royal Ulster Constabulary, and loyalist paramilitary groups.  This strategy was a matter of some controversy within republicanism; some IRA members and supporters who disagreed with the strategy left to form Republican Sinn Féin in 1986.

Northern Ireland Unionist Party: The Northern Ireland Unionist Party (NIUP) was a small political party in Northern Ireland.  It was formed in January 1999 as a splinter party from the UK Unionist Party (UKUP).  This split was caused by disagreement between the five UKUP members of the Northern Ireland Assembly.  Four of the members disagreed with UKUP leader Robert McCartney's policy of resigning from the Assembly should Sinn Féin become part of the power-sharing executive.  Cedric Wilson, Patrick Roche, Norman Boyd and Roger Hutchinson disagreed with McCartney, wanting to remain in the Assembly to challenge unionists in favour of the Belfast Agreement.  McCartney disciplined these members in their absence and, in response, they left the UKUP and formed the NIUP.  Led by Wilson, the new party argued that it had the support of the grassroots membership of the UKUP, but McCartney disputed this.

Italian general election, 1968: General elections were held in Italy on 19 May 1968 to select the Fifth Republican Parliament.  Democrazia Cristiana (DC) remained stable around 38% of the votes.  They were marked by a victory of the Communist Party (PCI) passing from 25% of 1963 to c. 30% at the Senate, where it presented jointly with the new Italian Socialist Party of Proletarian Unity (PSIUP), which included members of Socialist Party (PSI) which disagreed the latter's alliance with DC.  PSIUP gained c. 4.5% at the Chamber.  The Socialist Party and the Democratic Socialist Party (PSDI) presented together as the Unified PSI–PSDI, but gained c. 15%, far less than the sum of what the two parties had obtained separatedly in 1963.

Socialist Party of Northern Ireland: The Socialist Party of Northern Ireland, sometimes known as the Northern Ireland Socialist Party, was a small socialist group based in Northern Ireland in the 1930s.

Lithuanian Helsinki Group: The Lithuanian Helsinki Group (full name: the Public Group to Promote the Implementation of the Helsinki Accords in Lithuania; Lithuanian: "Helsinkio susitarimų vykdymui remti Lietuvos visuomeninė grupė" ) was a dissident organization active in the Lithuanian SSR, one of the republics of the Soviet Union, in 1975–81.  Established to monitor the implementation of the Final Act of the Conference on Security and Cooperation in Europe, better known as Helsinki Accords, it was the first human rights organization in Lithuania.  The group published over 30 documents that exposed religious repressions, limitations on freedom of movement, political abuse of psychiatry, discrimination of minorities, persecution of human right activists, and other violations of human rights in the Soviet Union.  Most of the documents reached the West and were published by other human rights groups.  Members of the group were persecuted by the Soviet authorities.  Its activities diminished after it lost members due to deaths, emigration, or imprisonment, though it was never formally disbanded.  Some of the group's functions were taken over by the Catholic Committee for the Defense of the Rights of Believers, founded by five priests in 1978.  Upon his release from prison, Viktoras Petkus reestablished the Lithuanian Helsinki Group in 1988.

Socialist Party of Transylvania: The Socialist Party of Transylvania was a political party in Romania, active primarily in Transylvania.  Born out of the ethnic Romanian section of the Social Democratic Party of Hungary (MSZDP), it gradually attracted other socialist and social-democratic groups active in the Transleithanian lands of Austro-Hungary incorporated into the Kingdom of Romania after World War I.  Although initially it claimed, under the title Social Democratic Party of Transylvania and Banat, the adherence of the MSZDP party sections in Banat, the latter, while maintaining close links with the Transylvania party, constituted themselves as a distinct political organization.  The party also actively sought the cooperation of the socialist parties active in other regions of Romania, working towards a unified political party of the working class.  Such plans were however soon thwarted by repression from the part of the Romanian authorities, as well as disagreements both inside the party and among the different socialist formations of Romania.  The disagreements were further aggravated by the request of the Third International that the leaders of the party that had collaborated with the Romanian National Party be excluded from the merger, and eventually resulted in the split between the reformist social-democrats and the revolutionary-minded communists.  While the former decided to retire from unification talks and re-establish an independent Transyvanian party, the latter joined the majority of Socialist Party of Romania (PSR) to create the Communist Party of Romania in May 1921.  The social-democratic faction would late join the PSR members that disagreed with the new orientation of their party, founding the Romanian Social Democratic Party in 1927.

Provisional Irish Republican Army: The Provisional Irish Republican Army (Provisional IRA) was an Irish republican paramilitary organization that sought to remove Northern Ireland from the United Kingdom and to bring about an independent socialist republic encompassing all of Ireland.  It was the biggest and most active republican paramilitary group during the Troubles.  It saw itself as the successor to the original IRA and called itself simply the Irish Republican Army (IRA), or "Óglaigh na hÉireann" in Irish, and was widely referred to as such by others.

Funeral (album): Funeral is the debut studio album by Canadian indie rock band Arcade Fire, released on September 14, 2004 in North America by Merge Records and on February 28, 2005 in Europe by Rough Trade Records.  It was given its title because several band members had recently lost members of their families: Régine Chassagne's grandmother died in June 2003, Win and William Butler's grandfather (swing musician Alvino Rey) in February 2004, and Richard Reed Parry's aunt in April 2004.

Unified Socialist League: The Unified Socialist League (Japanese: "Toitsu shakaishugi domei" , abbreviated Toshado) was a pro-Soviet communist organization in Japan, founded on May 3, 1962.  The Unified Socialist League was led by Kasuga Shojiro, formerly a leading figure in the Japanese Communist Party.  Makoto Omori was the general secretary of the organization.  The organization emerged from a split from the Preparatory Communission for a Socialist Reform Movement (a.k.a. the 'Socialist Renovation' group).  The membership of the Unified Socialist League (numbering around 600) was dominated by students, and the organization had a student wing called the Socialist Student Front.

Movement of Socialists: The Movement of Socialists (Serbian: Покрет социјалиста , "Pokret socijalista", PS) is a socialist political party in Serbia.  Founded in 2008, it is currently led by Aleksandar Vulin, a former member of Yugoslav Left.  It is a part of the governing coalition with the Serbian Progressive Party (SNS).  It is formed by former members of the Socialist Party of Serbia because they disagreed with the pro-EU policy of the party.  However, It was a member of the pro-EU SNS-led coalitions in the 2012 parliamentary election (as part of Let's Get Serbia Moving alliance) and in the 2014 parliamentary election.

Supporting paragraphs: Armalite and ballot box strategy Provisional Irish Republican Army
Answer: Republican Sinn Féin