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The split in the Irish Republican Army, soon followed by a parallel split in Sinn Féin, was the result of the dissatisfaction of more traditional and militant republicans at the political direction taken by the leadership. Particular objects of their discontent were the IRA's unwillingness to engage in armed action against the British state or military defence of Catholic, nationalist areas in Northern Ireland, and Sinn Féin's ending of its policy of abstentionism in Ireland. This issue is a key one in republican ideology, as traditional republicans regarded the Irish state as illegitimate and maintained that their loyalty was due only to the Irish Republic declared in 1916 and in their view, represented by the IRA Army Council.
During the 1960s, the republican movement under the leadership of Cathal Goulding radically re-assessed their ideology and tactics after the dismal failure of the IRA's Border Campaign in the years 1956-62. They were heavily influenced by popular front ideology and drew close to Communist thinking. A key intermediary body was the Communist Party of Great Britain's organisation for Irish exiles, the Connolly Association. The Marxist analysis was that the conflict in Northern Ireland was a "bourgeois nationalist" one between the Protestant and Catholic working classes, fomented and continued by the ruling class. Its effect was to depress wages, since worker could be set against worker. They concluded that the first step on the road to a 32-county Socialist Republic in Ireland was the "democratisation" of Northern Ireland (i.e., the removal of discrimination against Catholics) and radicalisation of the southern working class. This would allow "class politics" to develop -eventually resulting in a challenge to the hegemony of both "British imperialism" and the respective unionist and nationalist establishments North and South of the Irish border.
Goulding and those close him argued that, in the context of sectarian division in Northern Ireland, a military campaign against the British presence would be counter-productive, since it would delay the day when the workers would unite around social and economic issues.
The sense that the IRA seemed to be drifting away from its conventional republican and nationalist roots into Marxism angered the more traditional republicans. Many in the Official IRA later referred to the Provisional IRA as "the rosary brigade" because of what they saw as the Catholic and romantic nationalist ideology of the latter. Some radicals believed that the Irish government, MI5, and the Central Intelligence Agency (CIA) had conspired to cultivate the split because they were afraid of another Cuba in Europe's "back yard". The Arms Crisis provided evidence that some members of the Irish (Fianna Fáil) government had attempted to supply arms and funds to a variety of individuals in Northern Ireland. The radicals viewed Northern Protestants with unionist views as "fellow Irishmen deluded by bourgeois loyalties, who needed to be engaged in dialectical debate". As a result, they were reluctant to use force to defend Catholic areas of Belfast when they came under attack from loyalists - a role the IRA had performed since the 1920s. Since the Civil Rights marches began in 1968, there had been many cases of street violence. The Royal Ulster Constabulary had been shown on television in undisciplined baton charges, and had already killed three noncombatant civilians, one a child. The Orange Order's "marching season" during the summer of 1969 had been characterised by violence on both sides, which culminated in the two day, "Battle of the Bogside" in Derry.