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In page Evel Knievel:

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Knievel regularly spoke out against the Hells Angels due to their alleged involvement in the drug trade.[2] A near-riot erupted during Knievel's show at the Cow Palace on March 3, 1971, when a Hells Angels member threw a metal object (either a tire iron or a Coca-Cola can, according to different witnesses)[citation needed] at Knievel. Knievel and a majority of the spectators fought back, injuring three of the fifteen Hells Angels members in attendance to the point that they required hospitalization.[citation needed]