The plea kicks off a fight for Mangione’s life, as the feds have said they will seek the death penalty.{ai:summary}<p>It seems there was no content provided for summarization. Please provide the text or details you'd like summarized, and I'll be happy to assist!</p>

Diehard Luigi Mangione fans rally outside NYC courthouse as he pleads not guilty to murdering UnitedHealthcare CEO Brian Thompson in federal death penalty case

Diehard Luigi Mangione fans rally outside NYC courthouse as he pleads not guilty to murdering UnitedHealthcare CEO Brian Thompson in federal death penalty case

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