Just the Beginning
The Rolling Stones had hired the Hells Angels to be Security at the festival. The biker gang was paid with 500 dollars worth of beer. Having a drunk biker gang as security doesn't seem like the smartest idea. As the day went on many began to realize that the day would not end as intended.
This is a photo of Marty Balin(Jefferson Airplane) knocked unconscious by Hells Angels, after this things only got worse.