University of California, Berkeley police have arrested a man they say was captured on video punching a conservative activist in the face on campus.
The university says Zachary Greenberg was arrested on Friday after an Alameda County judge issued a warrant for his arrest in the Feb. 19 assault on Hayden Williams.
It's unclear whether Greenberg has an attorney.
Williams was recruiting for the conservative group Talking Points USA at a school plaza when two men approached and one punched him during a confrontation.
Williams, who had a black eye, told Fox News that the men objected to a sign that said "Hate Crime Hoaxes Hurt Real Victims."
The attack was captured on student cellphones.
Neither Williams nor Greenberg are affiliated with UC Berkeley.