Fan violence at Levi's Stadium, again.  In the video taken after Monday nights 49ers / Vikings game two men in 49ers jerseys are seen kicking a man in a Vikings jersey while he tries to get up off the ground.

Others in the crowd appear to be kicking and yelling at the man on the ground in the Vikings Jersey.

A security guard in a yellow shirt tries to break things up.  It also appears that some San Francisco fans are trying to come to the mans aid.

Eventually other security and crowd members manage to stop the beating and help the Vikings fan to his feet.

San Francisco fans have a violent history of fighting. In 2014 two men, 27-year-old Amador Rebollero and 34-year-old Dario Rebollero, were videotaped brutally beating two other men in the Levi's Stadium bathroom during a 49ers game.

Both of the attackers, who are brothers, had extensive rap sheets and are facing felony assault charges.

Amador Rebollero plead guilty to two felony counts of assault likely to cause great bodily injury and was sentenced to five years in state prison.

Dario Rebollero agreed to plead no contest to a felony assault charge in exchange for three years of probation and 30 days in county jail.

One of the victims was knocked unconscious and left with a serious brain injury.

This is a graphic video taken during that fight.