Conrado Higuera "Don" Sol was a Mexican lawyer and Institutional Revolutionary Party politician. He served as party secretary during the 1980s before becoming a member of the Mexican Congress from Mazatlan in 2000 to 2006 and Secretary of Public Security from 2007. Higuera Sol had dealings with crime bosses such as Joaquin Guzman Loera, Miguel Angel Felix Gallardo, and Amado Carrillo Fuentes, using his connections to crime to further his own ambitions of becoming President. He would also use these connections to serve as the nexus between the government and the cartels, doing the "dirty work" for several Mexican presidents by managing the drug cartels as they squabbled.
Conrado Higuera Sol worked as a lawyer before finding employment under the Institutional Revolutionary Party at the age of 26, and his career was on the rise due to his wise advice. In 1985, he advised PRI leader Adolfo Lugo Verduzco to strike back against the corrupt governor of Jalisco by tying him to the Guadalajara Cartel, a move that would force the governor to get back in line behind the PRI leadership. Higuera also found employment as an assistant to General Eugenio Blanco, and he worked with Blanco as he attempted to control the balance of power among the cartels. Sol decided to work with the drug cartels in order to gain enough influence to one day becom President; Sinaloa Cartel leader Joaquin Guzman Loera was both an ally and his worst enemy. In the end, he managed to secure Guzman Loera's arrest after naming him the most dangerous drug lord in Mexico, and he killed Blanco in self-defense after discovering his role in several rapes. In 2000, the new President, Vicente Fox, dismissed Higuera Sol as the man in charge of the anti-narcotics operations, but Higuera Sol charmed his wife Marta Sahagun into putting in a kind word for him. He correctly informed Fox that Ramon Arellano Felix had been killed before Fox even discovered from the police, earning Fox's trust.