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City Hall said the move had been made out of an abundance of caution, and that there were no known ties or threats to New York City.
In 2022, Kavanagh became the first female FDNY commissioner in the department's history.
The lawsuit was filed in U.S. District Court on Friday and accuses the city of suppressing speech criticizing the government during the high-profile event.
When Richard M. Daley became mayor, he "understood more than anybody ... that he had to address what was called Beirut-on-the-Lake at the time because of the racial divide," his brother Bill Daley told the Sun-Times.