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The first time I felt unsafe at a Trump event was a week ago in New Orleans.

I hadn’t been on the Trump beat for The New York Times for very long, but the warm Friday night rally in an airport hangar on the outskirts of the city thrummed with an ominous energy. Donald J. Trump took the stage just as the sky was slipping from purplish twilight to slate black, and the mood shifted, as well, turning tense and electric.

The first interruption came early, followed by another, and another, as a constant stream of protesters disrupted the event. Some went peacefully and quietly as they were escorted out by security officers, but others did not, shouting obscenities and dropping to the ground to resist.

The crowd turned angry, jostling and pushing and jeering the disrupters. One young woman, a Trump supporter, was shoved against the metal barricades and began to cry. A group of older women left early, shortly after a man holding a “K.K.K. 4 Trump” sign was hustled out nearby.