Dozens of LA Galaxy and LAFC supporters were involved in a wild melee following the two teams' rivalry game Sunday ... and the entire, violent incident was caught on video.
A bystander captured the chaos at Dignity Health Sports Park in Los Angeles following the Galaxy's 1-1 draw with LAFC ... and you can see in the footage, multiple people threw and landed huge punches and kicks.
It's unclear what set off the altercation ... but even with security guards and what appears to be police officers present -- fans still tried to beat the hell out of each other.