Oscar Hagelsieb
Mexican-American former U.S. federal law enforcement professional specializing in border security, undercover operations, and investigations into organized crime and cartel activity, formerly Assistant Special Agent in Charge of HSI El Paso and featured in the documentary Kingdom of Shadows.
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Mar 2, 2026 • 2h 40min
Inside Cartel Conflict and the Reality At The Border | Oscar Hagelsieb | Ep. 435
Oscar Hagelsieb, a Mexican-American former federal investigator who rose from Border Patrol to ASAC of HSI El Paso and appears in Kingdom of Shadows. He recounts undercover work infiltrating cartels and smuggling rings. He discusses cartel drone tactics, plaza politics, operational strain on investigations, policy limits at the border, and the personal toll of undercover life.
