Adolfo de Jesús Constanzo (November 1, 1962 – May 6, 1989) was a Cuban-American serial killer, drug dealer and cult leader who led an infamous drug-trafficking and occult gang in Matamoros, Tamaulipas, Mexico, that was dubbed the Narcosatanists (Spanish: Los Narcosatánicos) by the media.

As a teenager, he became apprenticed to a local sorcerer and began to practice a religion called Palo Mayombe, which involves animal sacrifice.

[citation needed] As an adult, Constanzo moved to Mexico City and met the men who were to become his followers: Martín Quintana, Jorge Montes and Omar Orea.

They began to run a profitable business casting spells to bring good luck, which involved expensive ritual sacrifices of chickens, goats, snakes, zebras and even lion cubs.

He also attracted other rich members of Mexican society, including several high-ranking corrupt policemen who introduced him to the city's powerful drug cartels.

[2] This process escalated until Constanzo eventually decided that the gang needed the power of a brain from an American student, culminating with the 1989 murder of Mark Kilroy.

Constanzo began to believe that his magic, much of which he took from Palo Mayombe, was responsible for the success of the cartels and demanded to become a full business partner with one of the most powerful families he knew, the Calzadas.

[5] Police quickly discovered the cult and that Constanzo had been responsible for Kilroy's death; he sought a "good"/superior brain" for one of his ritual spells.

Officers raided the ranch and discovered Constanzo's cauldron, which contained various items such as a dead black cat and a human brain.

Determined not to go to prison, he handed the gun to follower Álvaro de León and ordered him to open fire on him and Martín Quintana.

On March 1, 2018, the ID Channel series Pandora's Box: Unleashing Evil portrayed the crimes in an episode entitled "The Devil's Ranch".