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Brownshirts: Waving Mexican flags anti-Trump protesters at a Trump rally in California today threw objects and started fires, with a number getting arrested.
There was a very strong police presence, which appears to have contained the violence. More details here, which describes the protests in more detail, including one story of a Trump protester throwing an egg at Trump supporter.
Protesting Trump is fine. Trying to suppress a Trump rally with violence is not. To me it appears that the only thing that prevented these anti-Trump protesters from getting out of control was the police.