This seems to have only been picked up briefly by AP, so I’ll just include the first line from the Washington Post’s coverage, which pretty much says it all:
Several Romans dressed as gladiators have climbed the Colosseum to protest a crackdown on their unauthorized business of posing with tourists for money. [...]
But for the full effect, check out the slideshow at La Reppubblica (which even has a bit of Classical ink) … and they’ve got a video too … full article: Colosseo, blitz dei gladiatori in quattro salgono sul primo anello
… I’m waiting with baited breath for them to start chanting Io sono Spartaco!