The union is legal and it is one of the four major organisations of its kind in the Basque Country. In the last decades it has mostly collaborated with the other nationalist union, ELA, while both have been opposed often by the Spanish-wide trade unions, UGT and CC.OO., that make up their own bloc.
^Faraldo, José M. (2010), "Spain: The Common Experience of Transition and a Military Coup", Solidarity with Solidarity: Western European Trade Unions and the Polish Crisis, 1980–1982, Lexington Books, p. 54