This is because the Good Friday Agreement has created complex agreements between the various parties. The three areas of action of the pact have created a network of institutions to govern Northern Ireland (Strand One), bring together the heads of state and government in Northern Ireland with those of Ireland (Strand Two or North-South Cooperation) and bring together heads of state and government from across the United Kingdom and Ireland (Beach 3 or East-West). There are currently more than 140 areas in Northern Ireland-Republic of Ireland, cross-border cooperation, including health services, energy infrastructure and police work. Many experts and political leaders fear that any disruption of this cooperation could undermine confidence in the agreement and hence the basis for peace in Northern Ireland. As part of the agreement, the British Parliament repealed the Government of Ireland Act 1920 (which had founded Northern Ireland, divided Ireland and asserted territorial right to the whole of Ireland) and the people of the Republic of Ireland amended Articles 2 and 3 of the Irish Constitution, which asserted a territorial right to Northern Ireland. Some observers fear that the UK`s withdrawal from the EU could threaten the Good Friday agreement; Among them was Tony Blair, the British Prime Minister, who presided over the agreement. Irish Prime Minister Leo Varadkar repeated this point in March 2018, arguing that Brexit “threatens to widen a gap between Britain and Ireland, between Northern Ireland and the Republic of Ireland, and possibly between the two communities in Northern Ireland.” (Varadkar announced his resignation after his party lost in the Irish parliamentary elections in February 2020. Sinn Fein politicians have called Brexit “the greatest threat in the history of the peace process.” On the Unionist side, the “no” campaign was much stronger, pointing to what were presented as concessions to denial and terrorism, in particular the release of convicted paramilitaries (often those who had killed friends and relatives of Unionist politicians and were serving “life sentences”), the presence of “terrorists” (what they thought of Sinn Féin) to the government , the absence of guarantees for the downgrading of the perceived bias of the process towards a united Ireland, the lack of confidence in all those who would implement the agreement, the erosion of British identity, the destruction of the Royal Ulster Constabulary, the vague language of the agreement and the hasty manner in which the agreement was written.