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José Reinaldo Fiallo, also known as "Mono Jojoy" was a prominent hitman for the Medellin Cartel, a Colombian drug trafficking organization that gained notoriety in the 1980s. Fiallo was a central figure within the cartel, carrying out assassinations, kidnappings, and other criminal activities to further the organization's goals. He played a significant role in establishing and maintaining the cartel's power and influence during its peak.