There were loud explosions and fistfights among members of both groups, and a citizen militia group wearing security gear showed up to protect the pro-Trump demonstrators.
Another Trump supporter, Ben Bergquam of Fresno, was also bloodied as the melee moved from the park up Center Street toward the UC Berkeley campus. The issue is not whether the rally crowd also drew Trump supporters of color, or many Trump fans who claim to despise white nationalism. No one who did not participate in the event was injured, police said.
At around 10am, they were met by an equally-sized group of counter-demonstrators. "In fact, I would kind of enjoy it".
Police made light-handed attempts to keep peace in the park but spent most of their time on the sidelines after their barricade broke.
Giving a speech at a well-secured end of the park, alt-right blogger Laura Southern railed against societal change, Kim Kardashian and the media.
"There's a difference between free speech and free action", said Esfandir, an anti-Trump protester.
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"We must become like them", she said referring to her opponents, "subversive".
Pro and anti-Trump supporters are separated by a barrier set up police during competing demonstrations at Martin Luther King Jr. Civic Center Park when several people started pushing each other. He said the sign "means we're sick of living under neocon rule".
The police presence was light there and only two or three officers were seen near the crossroads.
Police banned anything that could be used as a weapon - or had been in past rallies - such as pepper spray, mace, baseball bats and glass bottles. He had hoped to "show empathy is the beginning of understanding".
"I got pepper sprayed and hit by a bunch of sticks", said anti-Trump activist Al Alegria of Sacramento.
An anti-Trump protester named Geoff Millard said the rallies by pro-Trump campaigners were meant to intimidate the other side.
All this occurred despite police efforts to prevent a repeat of the violence and vandalism that occurred in the city in February, after a university canceled a scheduled talk by former Breitbart News editor Milo Yiannopoulos. It was the third time the two sides were involved in violence since President Donald Trump took charge.