to attack people who were protesting Confederate street names in Hollywood, Fla. He pleaded no contest to aggravated assault and served probation.

Mr. Monzon, now 26 and the vice president of the Miami Springs Republican Club, said he had been on a “path to de-radicalization” and disavowed the racist ideology he previously espoused. Still, when he ran unsuccessfully for the Hialeah City Council last year, he maintained some ties online to some of his League of the South friends.

He said the Proud Boys in the party assumed he would support them because of his past views.

“I’ve always been known as the radical one, so they were like, ‘Yeah, man, we’re going to get more of our people in here,’” he said.

Online sleuths, including a group called Miami Against Fascism, have identified party members who are or appear to be Proud Boys or otherwise affiliated with the far right and chronicled their social media activity, revealing connections to national figures and internal quarrels — including the Fontainebleau altercation on April 22.

It began when a woman who had a restraining order against Mr. Barcenas showed up at the dinner. Also present was the woman’s ex-boyfriend, Nowell Salgueiro, another committeeman, who had a restraining order against her.

Security escorted the woman and her husband out. But a friend of the woman’s and the friend’s husband remained.

Later that evening, the friend’s husband scrapped with Mr. Barcenas and Mr. Salgueiro. The friend said in court filings and in an interview that when she went outside to pay the valet she was also confronted by Mr. Salgueiro, whom she identified as a Proud Boy. He declined to comment.

In the days after, more accusations and petitions flew in court. On April 27, a West Miami Police officer served Mr. Salgueiro with restraining orders. He found him at the monthly meeting of the Miami-Dade Republican Party.

Kitty Bennett contributed research.

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