I don't know about any specific incidents, but at one time they were considered the most wild and unruly of performers when live. I quote from the liner notes from the album Shazam!: "...[They] adopt a wild stage act that was intended to rival The Who. They burned effigies on stage, smashed TV sets and set off fire alarms." No to mention Ace Kefford left the band because drummer Bev Bevan almost strangled him to death...