Robert Mazur is a former undercover federal agent known for his work in the 1980s and 1990s. He played a crucial role in infiltrating drug cartels and money laundering operations, particularly those linked to the Medellín Cartel. His efforts led to significant arrests and the dismantling of major criminal networks. After retiring from law enforcement, Mazur became an author and speaker, sharing his experiences in the book titled "The Infiltrator". His story was also adapted into a film, further highlighting the challenges and dangers of undercover work in combating organized crime.