This weekend, Sunday, December 6th, marks the 40th anniversary of Altamont, the free concert the Rolling Stones put on at a speedway outside San Francisco to end their U.S. tour in 1969. It was meant to be like Woodstock. At a press conference before the event, Mick Jagger said, "It's creating a sort of microcosmic society which sets example to the rest of America as to how one can behave in large gatherings." More than 300,000 people attended. But things went very wrong. Hired as security, but full of acid and beer, the Hells Angels motorcycle club were not on the same blissed-out flower-children vibe as much of the [...]