CGrivner - Executive Assistant United States Attorney mario.peraza@u… Wed, 06/10/2026 - 07:05 John Grivner Executive Assistant United States Attorney Executive Assistant United States Attorney C. John Grivner serves as Executive Assistant United States Attorney for the Southern District of Florida. Prior to assuming this role, he served as the founding Chief of the Border and Immigration Crimes Enforcement (BICE) Section, where he led the District’s specialized section focused on investigations and prosecutions involving border security, maritime interdiction, narcotics trafficking, immigratio
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