Informal Anarchist Federation

The Informal Anarchist Federation (FAI; Italian: Federazione Anarchica Informale) is an insurrectionary anarchist organization. It has been described by Italian intelligence sources as a "horizontal" structure of various anarchist groups, united in their beliefs in revolutionary armed action. Groups and individuals comprising the FAI act both as separate organizations and also under the FAI, and are known to format group campaigns. The FAI notably shares similar aims and ideals with Conspiracy of Fire Nuclei (Synomosía ton Pyrínon tis Fotiás, abbrev. SPF), the two often working in solidarity with each other, the SPF being known to announce solidarity with FAI in their communiques. The group has its roots in Italy, but, since 2012, has begun executing attacks in various countries across the world.

Consistent with insurrectionary anarchism, the FAI is opposed to capitalism, nationalism, and Marxism.