The Union has called on its members to reject the Lansdowne Road Agreement.
Under the proposals, public servants are to receive an income boost of €2000 euro.
In a statement on Monday evening, the union says the proposals 'actively discriminate' against their members in terms of the final outcome, which its labelled 'grossly unfair'.
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It goes on to say they union are now considering a 'range of options', including industrial action.