A neo-nazi graffiti group which collaborates with many local neo-nazi and nationalist groups (Zouaves, Alvarium…). It is named in reference to a bombing attack in Paris on September 11 1937 committed by a far-right organisation CSAR (Comité secret d’action révolutionnaire) nicknamed “la Cagoule”.

https://gallica.bnf.fr/blog/11092017/11-septembre-1937-le-complot-de-la-cagoule?mode=desktop