Question:  Seán Mackin had been a member of the Irish National Liberation Army, an Irish republican socialist paramilitary group formed during what year?

Context paragraphs:
Irish National Liberation Army: The Irish National Liberation Army (INLA, Irish: "Arm Saoirse Náisiúnta na hÉireann" ) is an Irish republican socialist paramilitary group formed in December 1974, during "the Troubles".  It seeks to remove Northern Ireland from the United Kingdom and create a socialist republic encompassing all of Ireland.  It is the paramilitary wing of the Irish Republican Socialist Party (IRSP).

Jimmy Brown (Irish republican): Jimmy Brown (1956 – 18 August 1992) was a Belfast member of the Official IRA, then Irish Republican Socialist Party (IRSP) and the Irish National Liberation Army (INLA), and latterly of the Irish People's Liberation Organisation (IPLO).

Irish People's Liberation Organisation: The Irish People's Liberation Organisation was a small Irish republican paramilitary organisation which was formed in 1986 by disaffected and expelled members of the Irish National Liberation Army (INLA) whose factions coalesced in the aftermath of the supergrass trials.  It developed a reputation for intra-republican and sectarian violence and criminality, before being forcibly disbanded by the Provisional Irish Republican Army (IRA) in 1992.

Seán Mackin (Irish republican): Seán Mackin is an Irish republican from Belfast, Northern Ireland and a fundraiser for the Friends of Sinn Féin (FOSF).  Mackin, who had been a member of the Irish National Liberation Army, left Belfast with his family and applied for political asylum in the United States, alleging harassment and threats from the security forces.  Mackin was also under threat from a murderous internal feud within the INLA.  Immigration Judge Annette Elstein granted Mackin's wife and daughter Philomena and Jennifer political asylum in 1991.  Seán Mackin was not granted asylum (as is sometimes misreported) but was granted "suspension of deportation," a different (and, ironically, faster) route to permanent residency and U.S. citizenship.  The Mackins also have two sons, Seán Óg and Kieran, who are both United States citizens by birth.  The entire family have since become United States citizens.  In 2004, Mackin was detained by police while visiting Belfast, which was interpreted by many as an attempt to disrupt or discredit Mackin's work for FOSF.

Hugh Torney (Irish republican): Hugh Torney (c.1954 – 3 September 1996) was an Irish National Liberation Army (INLA) paramilitary leader best known for his activities on behalf of the INLA and Irish Republican Socialist Party (IRSP) in a feud with the Irish People's Liberation Organisation (IPLO), a grouping composed of disgruntled former INLA members, in the mid-1980s.

South Armagh Republican Action Force: The South Armagh Republican Action Force was an alleged Irish republican paramilitary group that was active from September 1975 to April 1977 during the Troubles in Northern Ireland.  Its area of activity was mainly the southern part of County Armagh.  According to writers such as Ed Moloney and Richard English, it was a covername used by some members of the Provisional IRA South Armagh Brigade.  The journalist Jack Holland, however, alleged that the group was made up of members of the Irish National Liberation Army (INLA).  According to Malcolm Sutton's database at CAIN, it was responsible for 24 deaths during the conflict, all of whom were classified as civilians.

Thomas &quot;Ta&quot; Power: Thomas Power was an Irish republican socialist, also known as Ta Power, who was a leading member of the Irish Republican Socialist Party (IRSP) and Irish National Liberation Army (INLA).  According to the Irish Republican Socialist Movement (IRSM) biography page on Power, he was "from Friendly Street in the Markets area of south Belfast, he had been in the Official IRA but joined the INLA in 1975 while a prisoner in Long Kesh."  Aged 33, he was shot and killed on 20 January 1987 in Rosnaree Hotel on the Dublin Road, outside Drogheda in County Louth, Ireland, alongside with INLA leader John O'Reilly.  Another man, Hugh Torney, was injured, by the Irish People's Liberation Organisation, which was largely composed of former INLA members, as he arrived to negotiate a truce.

Seamus Costello: Seamus Costello (Irish: "Séamus Mac Coisdealbha" , 1939 – 5 October 1977) was a leader of Official Sinn Féin and the Official Irish Republican Army and latterly of the Irish Republican Socialist Party (IRSP) and the Irish National Liberation Army (INLA).

Official Irish Republican Army: The Official Irish Republican Army or Official IRA (OIRA) was an Irish republican paramilitary group whose goal was to remove Northern Ireland from the United Kingdom and create a "workers' republic" encompassing all of Ireland.  It emerged in December 1969, shortly after the beginning of the Troubles, when the Irish Republican Army split into two factions.  The other was the Provisional IRA.  Each continued to call itself simply "the IRA" and rejected the other's legitimacy.  Unlike the "Provisionals", the "Officials" were Marxist and worked to form a united front with other Irish communist groups, named the Irish National Liberation Front (NLF).  The Officials were called the NLF by the Provisionals and were sometimes nicknamed the "Red IRA" by others.

Irish Republican Socialist Party: The Irish Republican Socialist Party or IRSP (Irish: "Páirtí Poblachtach Sóisialach na hÉireann" ) is a republican socialist party active in Ireland.  It is often referred to as the "political wing" of the Irish National Liberation Army (INLA) paramilitary group.  and claims the legacy of socialist revolutionary James Connolly, who founded the Irish Socialist Republican Party in 1896 and was executed after the Easter Rising of 1916.

Supporting paragraphs: Seán Mackin (Irish republican) Irish National Liberation Army
Answer: 1974