Euskadi Ta Askatasuna? I could tell you what it stands for thanks to Wikipedia, but the Basque language is unrelated to any other language on the planet, and may be the only fragment we have of the Pre Indo-European Languages spoken in Europe before the Neolithic Agricultural Revolution.
They're more whacko than the Bretons who at least have a language related to Cornish, Welsh, Irish, and Scots Gaelic, (?and Manx?)
The Basques call Catalu~na home, that's the top slice of Spain from Barcelona to the Atlantic, and extends north in some places across the border into France like Biarritz on the Bay of Biscay. ETA have been terrorists since the 60's blowing up Spanish aircraft, killing people in airports and on Trains, and associating with the PLO and the IRA and facilitating their movements and acquisition of arms. The SAS knocked off 5 IRA terrorists on Gibraltar. Because the 5 weren't armed at the time people got upset. I don't recall if they had weapons in their hotel rooms or not.
According to Andy McNab, ex SAS, the trick is to shoot them in the head so that "they drop like liquid" like a drop of water, totally relaxed, totally dead, instantly.
ETA is very hard to infiltrate because of the language and family associations.
Things are getting nasty around the Parliament building in Madrid. There's a huge protest going on that's starting to turn violent as of latest news reports.