In 1969, someone hired a group of Hells Angels (their price: $500 worth of beer) to play bodyguard at the Altamont Speedway Free Concert, where the Stones were headlining. Everything went wrong.
As bands played into the night, the audience, got more and more smashed on drugs on alcohol. Since concert stage was very close to the floor, the main barrier between the performers and an audience of 300,000 screaming fans were the Hells Angels, who were also high on whatever booze and drugs they had drank, smoked, dropped or injected.
It all came to an ugly head when the Stones were performing. Meredith Hunter, an 18-year-old, reportedly tried to rush the stage, was beat back by the Hells Angels, and then came back with a gun. During the tussle an Angel stabbed Hunter with a knife (which was captured on film), killing him.
Jagger later denounced the Hells Angels and refused to work with them again. That enraged the biker gang so much that they decided they were going to murder the lead singer.
According to a former FBI agent, “a boat of Hells Angels set out to take revenge on the singer at his holiday home in the Hamptons, Long Island, New York,” reports the BBC.
Planning to avoid security at Jagger’s Hampton home, they tried going around back through the garden, which abutted the seaside. Either by grace of God, pure luck, or because the Angels didn’t know how to read a weather report, a storm rolled in and tossed all the Angels overboard.
While they all survived, it apparently ended their desire to murder Mick, and those leather clad beasts of burden finally left him and the stones alone.