The event took place blocks away from University of California's Berkeley campus.
Berkeley police were planning for a number of contingencies, police spokeswoman Jenn Coats said in an email Saturday. "While I personally hold strictly to the principles of non-violence, I have never been able to say that antifa is necessarily wrong that Fascism may need to be confronted differently", he writes.
Greenwood said "the potential use of force became very problematic" given the thousands of peaceful protesters in the park.
It was not immediately clear if anarchists were among those arrested. East Bay residents are coming out in large numbers today in downtown Berkeley, protesting against hate-much like anti-hate demonstrators did yesterday in San Francisco.
Still hundreds of counter-protesters marched through the city.
A event called No to Marxism Rally was originally scheduled but the city of Berkeley denied a permit for it and the organizer asked supporters not to show up. Genocides in Rwanda and the former Yugoslavia started with "talking that dehumanizes people", she said. She was not seen there, though Gibson vowed to come and when he did anarchists set upon him.
A small group of anarchists dressed in black clothing and wearing masks attacked a tiny group of right-wing demonstrators who had gathered in a Berkeley park on Saturday and beat up at least four of them.
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A Ruptly producer, who was heard telling the protesters to back off, reported that the camera was damaged and they had to cancel the feed. One poor man had urine poured in his face. "You should be ashamed of yourself".
The organizers said the so-called Antifa activists wearing black masks who vastly outnumbered the far right group provided protection to counter protesters.
The California demonstrations took place only two weeks after a far-right rally in Charlottesville, Virginia, ended in tragedy, as a vehicle slammed into a crowd of counter-protesters, killing one woman. It was expected to draw members of white supremacist and nationalist groups, but only a few far-right supporters have turned out.
Police pulled one supporter of Trump out of the park over a wall by his shirt as a crowd of about two dozen counter-demonstrators surrounded him and chanted "Nazi go home" and pushed him towards the edge of the park. In all, there were an estimated 2,000 to 4,000 protesters-the vast majority of whom were there to demonstrate against white supremacists and far-right members who started the day with an "anti-Marxism" rally.
They assaulted at least three people by punching and kicking them.
In a statement Saturday, police encouraged everyone to "stay away" from the event.
The Berkeley Police Department was bolstered by the California Highway Patrol.
Despite the cancellation, counter-demonstration organizers chose to proceed with the "Rally Against Hate".