Mundo Mendoza and fellow EME carnal and VNE gang member Edward "Sailor Boy" Gonzalez began immediately terrorizing Los Angeles drug dealers and spreading the gospel of the Mexican Mafia. On a self-appointed mission of vendetta, Sailor Boy and Mundo journeyed up to Bakersfield to visit two Nuestra Familia drug dealers. Danny "Woodsey" Reyes and his brother Ronald had been targeted by the Mexican Mafia. Mundo and Sailor killed the Reyes brothers but got caught by the police trying to return to Los Angeles.
While in the Kern County Jail, Mundo and Sailor faced what seemed like a slam-dunk double murder case. They were looking with pride to return home to San Quentin, but this time to Death Row. But on Jan. 13, 1977, the presiding judge of Kern ruled to release the two EME hit men based on a motion for a speedy trial filed by their defense attorney.
During their Kern County jail-house stay, Mundo had been prayed over by visiting evangelists. He believes something unexpected happened to his soul. For the first time in his life, he felt remorse and empathy for his many victims. This was not the phony jail-house conversion played out by some crooks in an attempt to escape punishment or to fool the parole board. A technicality had already set Mundo free to return to his profane and self-destructive path. He chose the path of conversion and redemption, and it would not be easy.
Mundo requested a meeting with his former enemies in law enforcement, and began working undercover against his former carnales in the Mexican Mafia. As perilous as his occupation as a Mexican Mafia hit man was, working for law enforcement brought even more danger. Most cops instinctively distrusted him. Eventually, he would win them over by producing criminal intelligence leading to the arrests of many EME members.
In the movie
"American Me" (1992)
, Mundo's character is one of the central figures. Even after his defection, the movie's Mexican Mafia technical advisors, Manuel "Rocky" Luna and Charlie "Charlie Brown" Manriquez, included depictions of Mundo's character in the movie.