They are part of the Basque National Liberation Movement, an aggregation of leftist Basque nationalist forces including the illegal paramilitary organization Euskadi Ta Askatasuna (ETA) and the illegal parties Batasuna and Segi.
He was sent to prison in 1983 together with other Herri Batasuna members accused of singing the Basque fighters song Eusko Gudariak when the Spanish King Juan Carlos I went to Gernika.