Question: Jon Roberts, who helped author American Desperado, was associated with which cartel?
Sentence (from "Jon Roberts"): Jon Pernell Roberts (June 21, 1948 – December 28, 2011), born John Riccobono, was a noted drug trafficker and government informant, operated in the Miami area and was an associate of Colombia's Medellín Cartel during the growth phase in cocaine trafficking, 1975–1985.
Relevant evidence: Yes