The Unsolved Mystery of 'Pertur': 50 Years After the Disappearance of an ETA Leader

• Eduardo Moreno Bergaretxe, known as 'Pertur', a key ideological leader of ETA(pm), disappeared 50 years ago on July 23, 1976.
• He was a proponent of transitioning ETA's strategy toward a socialist, communist-aligned political movement, separating political work from armed struggle.
• His disappearance remains unsolved, with various theories pointing to internal ETA factions, security services, or far-right groups.

The Otsagabia Proposal

• Pertur and Francisco Javier Garayalde ('Erreka') drafted the Otsagabia proposal for the VII Assembly, arguing for the creation of an independent Basque workers' party.
• The strategy sought to establish a Marxist-Leninist vanguard to lead mass movements while subordinating armed actions to a defensive, political role.
• This position caused friction with the 'military' wing of ETA, who viewed any attempt to de-prioritize armed struggle as 'reformist' or 'liquidationist'.

Cultural Involvement and Early Life

• Before his political leadership, Pertur was active in ETA's 'Cultural Front', which promoted Basque identity and attempted to establish a museum in Gernika with art donations from figures like Joan Miró and Antoni Tàpies.
• His radicalization was influenced by the political persecution of his brother and the broader state repression during the Franco era.
• Outside of politics, he was a musician who performed with the group 'Los Amis' and was a contemporary of figures such as Jaime Mayor Oreja.

Circumstances of Disappearance

• Tensions peaked after Pertur dissented from the decision by ETA's 'Bereziak' (special commando) faction to execute businessman Ángel Berazadi.
• He was abducted shortly after, despite having held a leadership position in the Executive Committee.
• Conflicting accounts from former militants and historical investigations suggest possible collusion between state security services and neo-fascist mercenaries, though no concrete proof has emerged in five decades.