UC Berkeley riot raises questions about free speech

Violence puts spotlight on school’s decision to cancel speech by Trump supporter. UC Berkeley has been long heralded as the birthplace of the country’s free speech movement. But after violent protests this week forced the school to cancel the scheduled appearance of alt-right icon Milo Yiannopoulos, some are wondering if Berkeley is where free speech is hitting a roadblock.

After the protest on Wednesday evening by more than 1,500 demonstrators outside the Martin Luther King Jr. Student Union began to turn violent, instigated in part by what campus officials described...