It was 53 years ago today (December 6th, 1969) that the Rolling Stones held their ill-fated free concert at the Altamont Speedway in Livermore, California. The bill, which also included Santana, the Jefferson Airplane, the Flying Burrito Brothers, and Crosby, Stills, Nash & Young, is mainly remembered for the violence instigated by the Hells Angels motorcycle gang, whom the Stones had hired as security -- and the murder of concert-goer Meredith Hunter by Hells Angel Alan Passaro. Passaro was later acquitte...