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Chris Cuomo, the CNN anchor and member of a New York political dynasty, unleashed a spate of profanity-laced insults and threatened to throw a man down some stairs after the man apparently called him Fredo, a reference to the “Godfather” film trilogy, according to a video that spread across social media on Monday night.

The video, originally shared on the conservative YouTube channel That’s the Point With Brandon, does not show the comment that sparked the incident. But it captures Mr. Cuomo’s furious response as he takes umbrage at the remark, which he called tantamount to “the n-word” for Italian-Americans.

“My name is Chris Cuomo,” he says in the video. “I’m an anchor on CNN. Fredo is from ‘The Godfather.’ He was that weak brother. And they use it as an Italian aspersion.”

Mr. Cuomo’s brother is Gov. Andrew M. Cuomo, and their father was the former governor Mario M. Cuomo. In the “Godfather” films, Fredo Corleone is the feeble, ineffectual brother of the Mafia leader Michael Corleone, and is resentful that Michael became the heir to the family’s business.