The "Hamburg Theses" surely constitute the most mysterious of all the documents that emanated from the SI; many of these documents have been widely distributed and some have been distributed discretely.
The "Hamburg Theses" were evoked several times in situationist publications, but a single quotation from it was never given. For example, in Internationale Situationniste #7, pages 20, 31 and 47; more indirectly in I.S. #9, page 3 (in the title of the editorial note "Now, the SI"); and also in the still unpublished contributions of Attila Kotanyi and Michele Bernstein to the debate concerning A. Kotanyi's programmatic propositions in 1963. The "Theses" are mentioned without commentary in the "table of works cited" (page 99) of Raspaud and Voyer's Situationist International (Protagonists, Chronology, Bibliography).
Here we have conclusions (voluntarily kept secret) from a theoretical and strategic discussion that concerned the totality of the conduct of the SI. This discussion took place during two or three days at the beginning of September 1961, in a series of haphazardly chosen bars in Hamburg, between G. Debord, A. Kotanyi and R. Vaneigem, who were then returning from the Vth Conference of the SI, which was held in Goteborg between 28 and 30 August. Alexander Trocchi, who wasn't present in Hamburg, subsequently contributed to the "Theses." With the intention of not leaving any trace that could be observed or analyzed from outside of the SI, nothing concerning this discussion and what conclusions it reached was ever written down. It was found that the simplest summary of its rich and complex conclusions could be expressed in a single phrase: "The SI must now realize philosophy." Even this very phrase wasn't written down. Thus, the conclusions were so well hidden that they have remained secret until now.
The "Hamburg Theses" have had a considerable importance in at least two regards. First because they marked the end of the first part of the SI's history. But also as [an instance of] experimental practice: from this point of view, the "Theses" were a striking innovation in the succession of artistic avant-gardes, which until then had given the impression of being avid to explain themselves.
The summarized conclusion evoked a celebrated formula of Marx (in his 1844 text "Contribution to the Critique of Hegel's Philosophy of Right"). At that moment, this summary signified that one must no longer give the least importance to the conceptions of any of the revolutionary groups that still existed as inheritors of the old social emancipation movement that was destroyed in the first half of our century; and that it would no longer be necessary to count on the SI alone to relaunch a new era of contestation by renewing all of the starting points of the movement that was constituted in the 1840s. These points did not imply the forthcoming break with the artistic "right" of the SI (which weakly wanted to continue or merely repeat modern art), but rendered it extremely probable. One can thus recognize that, for the SI, the "Hamburg Theses" marked the end of its first era -- research into a truly new artistic terrain (1957-61) -- and also fixed the departure point for the operation that led to the movement of May 1968 and subsequent events.
On the other hand, if one only considers the experimental originality -- that is to say, the absence of any redaction of the "Theses" -- then the subsequent socio-historical applications of its formal innovations (after they had been subjected to a complete reversal, of course) are also quite remarkable. Hardly more than twenty years later, one could in fact see that the procedure had encountered a bizarre success at the highest levels of several States. One knows since then that several truly vital conclusions -- which some were loathe to record into computer networks, magnetic tapes or telexes, and even refused to use typewriters and photocopiers -- were simply learned by heart. The original notes, sketched out in handwriting, were destroyed.
This note was written specially for Thomas Y. Levin, who has indefatigably traversed the world to find the traces of the effaced art and the diverse historical crimes of the Situationist International.Guy Debord
 Signature followed by Guy Debord's Chinese seal.
(Published in Guy Debord Correspondance, Vol 7: Janvier 1988-Novembre 1994 by Librairie Artheme Fayard, 2008. Translated from the French by NOT BORED! December 2008. Footnote by the publisher.)