At its 1986 Ard Fheis , Sinn Féin delegates passed a resolution to amend the rules and constitution that would allow its members to sit in the Dublin parliament ( Leinster House/D áil Éireann ) .
At its 1986 Ard Fheis , Sinn Féin changed its and constitution to allow its members to sit in the Dublin parliament ( Leinster House/D áil Éireann ) .