Question: What is Juan García Ábrego's uncle's nickname?

full_context: Document 1: Carlos Rosales Mendoza: Carlos Alberto Rosales Mendoza (12 February 1963 – 27 December 2015) was a former Mexican drug lord who founded and led an organized crime syndicate called La Familia Michoacana. He was a close friend and associate of Osiel Cárdenas Guillén, the former leader of the Gulf Cartel.
Document 2: Héctor Manuel Sauceda Gamboa: Héctor Manuel Sauceda Gamboa (died 17 February 2009), commonly referred to by his alias El Karis, was an alleged drug trafficker and high-ranking leader of the Gulf Cartel (Spanish: "Cártel del Golfo"), a Mexican drug trafficking organization. He was the brother of the drug lord Gregorio Sauceda Gamboa, another high-ranking drug trafficker who worked under the tutelage of Osiel Cárdenas Guillén, the former top leader of the cartel.
Document 3: Guadalajara Cartel: The Guadalajara Cartel (Spanish: "Cártel de Guadalajara" ) was a Mexican drug cartel which was formed in the 1980s by Rafael Caro Quintero, Miguel Ángel Félix Gallardo and Ernesto Fonseca Carrillo in order to ship heroin and marijuana to the United States. Among the first of the Mexican drug trafficking groups to work with the Colombian cocaine mafias, the Guadalajara cartel prospered from the cocaine trade.
Document 4: Nabor Vargas García: Nabor Vargas García (born 12 July 1976) is a Mexican suspected drug lord and one of the founders of Los Zetas, a criminal group formed by former soldiers of the Mexican Armed Forces.
Document 5: Rafael Caro Quintero: Rafael Caro Quintero (born October 3, 1952) is a Mexican drug trafficker who founded the now-disintegrated Guadalajara Cartel with Miguel Ángel Félix Gallardo and other drug traffickers in the 1970s. He is the brother of fellow drug trafficker Miguel Caro Quintero, the founder and former leader of the extinct Sonora Cartel who remains incarcerated.
Document 6: Juan Nepomuceno Guerra: Juan Nepomuceno Guerra Cárdenas (July 18, 1915 – July 12, 2001) was a Mexican crime lord, bootlegger, businessman and smuggler who founded the Gulf Cartel, a drug trafficking organization. He is often considered the "godfather" of U.S-Mexico border cartels.
Document 7: Juan García Ábrego: Juan García Ábrego (born September 13, 1944) is a former Mexican drug lord who started out his criminal career under the tutelage of his uncle Juan Nepomuceno Guerra, who is reported to be the former head of a criminal dynasty along the U.S.-Mexico border now called the Gulf Cartel.
Document 8: Jalisco New Generation Cartel: The Jalisco New Generation Cartel (Spanish: "Cártel de Jalisco Nueva Generación" , "CJNG" and "Matazetas") is Mexican criminal group based in Jalisco and headed by Nemesio Oseguera Cervantes ("El Mencho"), one of Mexico's most-wanted drug lords. The CJNG are currently fighting the Knights Templar Cartel and Los Zetas for control of the cities of Guadalajara, Jalisco and the states of Michoacán and Veracruz. The CJNG also operates in the states of Nayarit, Colima, and Guanajuato. While this cartel is best known for its fights against the Zetas, it has also been battling La Resistencia for control of Jalisco and its surrounding territories.
Document 9: Rubén Oseguera González: Rubén Oseguera González (born February 14, 1990), commonly referred to by his alias El Menchito, is a suspected U.S.-born Mexican drug lord and former high-ranking leader of the Jalisco New Generation Cartel (CJNG), a criminal group based in Jalisco. He is the son of Nemesio Oseguera Cervantes (alias "El Mencho"), one of Mexico's most-wanted drug lords. Under his father, he allegedly worked as the CJNG's second-in-command and managed international drug trafficking operations.
Document 10: Francisco Rafael Arellano Félix: Francisco Rafael Arellano Félix (24 October 1949 – 18 October 2013) was a Mexican drug lord and former leader of the Tijuana Cartel, a drug trafficking organization. He was the oldest of seven brothers and headed the criminal organization early in the 1990s alongside them. Through his brother Benjamín, Francisco Rafael joined the Tijuana Cartel in 1989 following the arrest of Miguel Ángel Félix Gallardo, one of the most prominent drug czars in Mexico during the 1980s. When the Arellano Félix took control of the organization in the early 1990s, tensions with the rival Sinaloa Cartel prompted violent attacks and slayings from both fronts.
Document 11: Juárez Cartel: The Juárez Cartel (Spanish: "Cártel de Juárez"), also known as the Vicente Carrillo Fuentes Organization, is a Mexican drug cartel based in Ciudad Juárez, Chihuahua, across the U.S.-Mexico border from El Paso, Texas. The cartel is one of several drug trafficking organizations that have been known to decapitate their rivals, mutilate their corpses and dump them in public places to instill fear not only into the general public, but also into local law enforcement and their rivals, the Sinaloa Cartel. The Juárez Cartel has an armed wing known as La Línea, a Juarez street gang that usually performs the executions. It also uses the Barrio Azteca gang to attack its enemies.
Document 12: Juan José Esparragoza Moreno: Juan José Esparragoza Moreno (born February 3, 1949), commonly referred to by his alias El Azul (English: "The Blue One"), is a Mexican drug lord and leader of the Sinaloa Cartel, a drug trafficking organization. Originally a member of the Dirección Federal de Seguridad (DFS) police agency, he founded the Guadalajara Cartel in the 1970s along with other drug kingpins in Mexico. Following its disintegration in the late 1980s, he went on to lead the Juárez Cartel, and eventually settled in the Sinaloa Cartel. He worked alongside Joaquín "El Chapo" Guzmán, once considered Mexico's most-wanted drug lord.
Document 13: Osiel Cárdenas Guillén: Osiel Cárdenas Guillén (born May 18, 1967) is a former Mexican drug lord and the former leader of the Gulf Cartel (Spanish: "Cártel del Golfo" ) and Los Zetas. Originally a mechanic in Matamoros, Tamaulipas, where he was born, he entered the Gulf Cartel by helping Juan García Abrego, the capo at the time; when García Ábrego was arrested in 1996, some infighting erupted within the cartel. Osiel Cárdenas eventually took control by killing his friend and contender Salvador Gómez, earning Cárdenas the nickname ""El Mata Amigos"" (The Friend-Killer).
Document 14: Joaquín &quot;El Chapo&quot; Guzmán: Joaquín Archivaldo Guzmán Loera (] ; born on 25 December 1954 or 4 April 1957) is a Mexican drug lord who headed the Sinaloa Cartel, a criminal organization named after the Mexican Pacific coast state of Sinaloa where it was formed. Known as "El Chapo" ("Shorty", ] ) for his 168 cm stature, he became Mexico's top drug kingpin in 2003 after the arrest of his rival Osiel Cárdenas Guillén of the Gulf Cartel, and was considered the "most powerful drug trafficker in the world" by the United States Department of the Treasury.
Document 15: Vicente Carrillo Fuentes: Vicente Carrillo Fuentes (born October 16, 1962), commonly referred to by his alias El Viceroy, is a Mexican suspected drug lord and former leader of the Juárez Cartel, a drug trafficking organization. The cartel is based in Chihuahua, one of the primary transportation routes for billions of dollars' worth of illegal drug shipments entering the United States from Mexico annually. He was one of Mexico's most-wanted drug lords.
ground_truth: considered the "godfather"