In the late 1970s, ETA(pm) divided into two groups, with the bulk of the militants siding with the so-called Berezis (the Special Cells).

Those who stuck to the positions of ETA(pm)'s executive board defended the submission of ETA's violent actions to their political party EIA's needs (founding party of Euskadiko Ezkerra), often economical urges.

However, Spanish officials hard pressed on the newly formed party to immediately stop ETA(pm)'s actions or to face up to the consequences.

ETA(pm) - VII Assembly, through the mediation of its political alter ego, the party Euskadiko Ezkerra (Basque Country's Left), accepted a policy of individual pardons to all members who publicly renounced violence.

Many of its former members integrated into Euskadiko Ezkerra, which later fused with the Socialist Party of the Basque Country–Basque Country Left (PSE), the Basque affiliate of the national Spanish Socialist Workers' Party.