 He is considered to be one of the most dangerous members of ETA, considered a terrorist organization by the European Union, with police describing him as "extremely violent".He gained prominence in the military section of ETA by leading the 'commando Vizcaya' (Biscay Command) after the 2006 ceasefire along with Arkaitz Goikoetxea and rose to the highest level of ETA's military leadership following the December 2008 arrest of Aitzol Iriondo alias "Gurbita" who had replaced Miguel de Garikoitz Aspiazu Rubina alias "Txeroki", arrested less than a month before.Before joining ETA, Jurdan Martitegi had a wide record of kale borroka acts.