We continue our 100 darkest moments in pop culture history with a look back at what some have described as Woodstock gone wrong. In 1969 west coast concert promoters wanted to do a Woodstock for the west coast headlined by The Rolling Stones, the Grateful Dead, Cosby, Stills, and Nash, and others. After moving the location several times, it finally ended up at the Altamont Motor Speedway with around 300,000 people on hand. The security force was led by the Hell's Angels motorcycle club and things turned deadly.