From your link:
When antifascists forced the cancellation of the 82nd Avenue of Roses Parade, Trump supporters responded with a “March for Free Speech.” Among those who attended was Jeremy Christian, a burly ex-con draped in an American flag, who uttered racial slurs and made Nazi salutes. A few weeks later, on May 25, a man believed to be Christian was filmed calling antifa “a bunch of punk bitches.”
The next day, Christian boarded a light-rail train and began yelling that “colored people” were ruining the city. He fixed his attention on two teenage girls, one African American and the other wearing a hijab, and told them “to go back to Saudi Arabia” or “kill themselves.” As the girls retreated to the back of the train, three men interposed themselves between Christian and his targets. “Please,” one said, “get off this train.” Christian stabbed all three. One bled to death on the train. One was declared dead at a local hospital. One survived.
Mr. Christian (isn't that ironic) seems to be a standard bearer for the alt-right.