“Relations with manager [Dennis] Katz were crumbling fast, a process that climaxed in Milan on February 13, 1975. Reed was in Italy to launch the first leg of a world tour but took the stage to find the arena on the edge of pitched battle. The Masters of Creative Situations, a Communist action group, chose the gig as the venue for a confrontation with the police, which necessarily spilled over onto the stage.”
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from Dave Thompson, Your Pretty Face is Going to Hell: The Dangerous Glitter of David Bowie, Iggy Pop, and Lou Reed (NY: Backbeat Books, 2009), page 241.
RADICAL ARCHIVES NOTE: Googling this group doesn’t turn anything up; I am assuming they are autonomists by their name, which might also be rendered incorrectly. If you know anything about them, please post it in the comments.
Update December 2013: History is Made at Night has a good post about this.