US Crime NewsMan Arrested for Stabbing One Year After Assaulting Activist in BerkeleySaveMark Us Preferred on GooglePrintThe man, later identified as Zachary Greenberg, who attacked conservative activist Hayden Williams at the University of California at Berkeley on Feb. 20, 2019. Courtesy of Brad Devlin, @bradleydevlin/TwitterZachary StieberSenior Reporter8/14/2020|Updated: 8/15/2020The man caught on video assaulting a conservative activist in California last year was arrested this week for allegedly stabbing another man.Zachary Greenberg, 30, was arrested on Sunday night after officers responded to a report of an assault in progress in Princeton, Calif.We had a problem loading this article. Please enable javascript or use a different browser. If the issue persists, please visit our help center.