In the latest crackdown by less than tolerant liberals against free speech, on Wednesday night hundreds of protesters at University of California in Berkeley smashed windows, set fires and clashed with police as they forced a controversial “alt-right” speaker to cancel his appearance at the liberal-leaning institution.

Two hours before Breitbart News editor Milo Yiannopoulos was to give a speech at the student union, protesters tossed metal barricades and rocks through the building’s windows and set a light generator on fire near the entrance, footage from news outlets showed.

Police ordered protesters to disperse as the school put the campus on lockdown. Protesters also tossed bricks and fireworks at police in riot gear who fired rubber pellets back at the crowd, according to SFGate.com, a news outlet in San Francisco.

“We shut down the event. It was great. Mission accomplished,” a protester told CNN.

Some 150 “masked agitators” were responsible for the violence during the otherwise largely peaceful protest of about 1,500 people, the university said in a statement, noting that the school “is proud of its history and legacy as home of the Free Speech Movement” in the 1960s. Many have expressed curiosity if the masked agitators are the same ones who tried to provoke violence during Trump’s inauguration and if they are funded by certain financially endowed “liberal” organizations linked to George Soros.

Donald Trump’s chief strategist, Steve Bannon, previously headed Breitbart News and CNN reported that many of the protesters voiced opposition to the Republican president.

One protester at Berkeley held a sign that said “No Safe Space for Racists” while other protesters danced to hip hop music, footage from a Facebook Live feed showed. Protesters later marched along streets near the campus where some smashed storefront windows and car windshields while clashing with police, the feed showed.

Yiannopoulos, whose account on Twitter was suspended last year after he was accused of participating in the online harassment of an African-American actress, criticized “the Left”, saying in a statement it was “absolutely terrified of free speech and will do literally anything to shut it down.”

He also said on Fox News that he was evacuated by police after protesters began throwing rocks and other objects at the building. “Obviously it’s a liberal campus so they hate any libertarians or conservatives who dare to express an opinion on their campuses,” he said. “They particularly don’t like me.”

On Thursday morning, in a barrage of tweets that touched on topics as far ranging as Rex Tillerson, to the death of Navy SEAL Ryan Owens to the Iran ballistic missile test, Trump also lashed out at UC Berkley, and hinted that the university which “does not allow free speech and practices violence on innocent people with a different point of view” may see its federal funding yanked.

It was not immediately clear if any algos were confused by the Trump tweet and interpreted it as referring to interest rates or the Fed’s hiking plans.