a. tiqqun was a publication put out anonymously by a group that has come to be called the invisible committee. roughly the same group of people wrote a variety of texts: appel, the theory of bloom, the coming insurrection, to our friends, etc. this group was also implicated in a train sabotage, in a case in france called the case of the tarnac 9. tarnac is a small town in france where many of the invisible committee are living and creating infrastructure, including helping to care for each other and other members of the village.
b. some have called the theory of the invisible committee a restatement (in more modern language and with more philosopher references) of the theory of the situationists.
c. the invisible committee is not anarchist, they're communists, who believe in building a party (ie in the power of groups of people), but they're anarchist friendly (first there is overlap with many anarchists, second tIC is anti-state).
here is the wikipedia entry:
Tiqqun is the name of a French philosophical journal, founded in 1999 with an aim to "recreate the conditions of another community." It was created by various writers, before dissolving in Venice, Italy in 2001 following the attacks of 9/11/2001. The journal was the object of some interest in the media after the arrest of Julien Coupat, one of its founders.
Tiqqun is also, more generally, the name of the philosophical concept which stems from these texts, and is often used in a broad sense to name the many publications containing the journal's texts, in order to designate, if not a specific author, at least "a point of spirit from which these writings come."
The name of the journal comes from the great importance that the writers give to the philosophical concept of Tiqqun (the best definitions are found in the texts Theory of Bloom and Introduction to Civil War). It is the French transcription of the original Hebrew term Tikkun olam, a concept issuing from Judaism, often used in the kabbalistic and messianic traditions, which simultaneously indicates reparation, restitution, and redemption. It has also come to designate, more broadly, a contemporary Jewish conception of social justice.
Tiqqun’s poetic style and radical political engagement are akin to the Situationists and the Lettrists. Tiqqun has influenced radical political and philosophical milieus, post-Situationist groups, and other elements of ultra-left, squat and autonomist movements, as well as some anarchists. Tiqqun’s themes and concepts are strongly influenced by the work of the Italian philosopher Giorgio Agamben, who in turn wrote a public editorial supporting Coupat's due process legal rights.
two relevant critiques of the invisible commitee have come from italian insurrectionists (to the customers) and frere dupont's piece for mute magazine: http://www.metamute.org/editorial/articles/release-to-us-field