It is the largest Basque nationalist party of the French Basque Country gathering around 10% of the votes in this territory. Its immediate goal is the establishment of a Pays Basque département out of Pyrénées-Atlantiques. In terms of ideology, besides Basque nationalist, it is a leftist political party.
It was founded as an electoral platform and in 2001 it was redesigned as a political party. In 2001, members of AB who desired a stronger link to Southern Basques left to form the Northern branch of Batasuna, a different party with a similar ideology which is now illegal in Spain.
The opinion newspaper most related to AB is Enbata.
- Jan Mansvelt Beck (10 November 2004). Territory and Terror: Conflicting Nationalisms in the Basque Country. Routledge. p. 103. ISBN 978-1-134-27605-9. Retrieved 6 May 2016.
- El Mundo: ETA arremete contra los escindidos de EH , 4 April 2002.