The word irrintzi refers originally to the traditional Basque folk high-pitched scream used to express celebration or happiness.
The first known action of Irrintzi was sabotage in 2006 around Bayonne (including a bomb against the summer house of the French Minister of the Interior Michèle Alliot-Marie).
Since then, the organization has attacked railroads, tourist sites, and political party headquarters, mainly by bomb.
The Monégasque chef Alain Ducasse, with a restaurant near Biarritz, was accused by Irrintzi of being a speculator and of "folklorising" the Basque Country, and was forced to leave the Basque Country due to the constant attacks that his restaurant suffered.
[1] Their declarations are usually closed by the slogan "Euskal Herria ez da salgai" (The Basque Country is not for sale).