Been meaning to post in this thread since it's inception, just read through it again and realized that I hadn't. Stay behind/Gladio stuff is one of my obsessions.
My two cents to add to this deals with how I first came to know about the Piazza bombing and whatnot.
Debord and Gianfranco Sanguinetti, during the death throes of the SI, wrote a pamphlet titled Rapporto veridico sulle ultime opportunità di salvare il capitalismo in Italia which claimed that the Piazza bombing and similar false flag attacks were supported by the ruling class in Italy as a means of safeguarding the nation from communism. This is when everybody took it for granted that the attacks were carried out by leftists.
I've long been of the opinion that Debord's financier, the french media mogul Gérard Lebovici, through connections with French elites, somehow found out about these false flag attacks and passed the information on to Debord and Sanguinetti, and when they later revealed themselves to be the authors of the pamphlet, this was figured out which eventually led to Lebovici's assassination ten or so years later. They tried to pin the assassination on Debord (who uncharacteristically, and successfully, sued for defamation) claiming that he was upset with Lebovici for his reluctance to finance a film project for him. I don't know, it's probably just paranoia on my part, but that's somehow always made sense in my mind. It could have been an Italian contact of the SI who tipped them off, when no one else seemed to be aware of the ongoings besides the conspirators, but my theory at least would make the assassination of Lebovici make some sort of sense.
On an unrelated note, the Order of the Solar Temple has been linked by some to the stay behind networks, though I think the connection is tenuous at best, but that interests me as well on account of the Solar Temple activities in Quebec in the 90's when I was growing up, which have always held a particular fascination for me, if only for their proximity. Anyone have any info on OTS and Gladio/Stay Behind?