In 2018, a hacker hired by the Mexican Sinaloa drug cartel run by the infamous kingpin Joaquín “El Chapo” Guzmán spied on the U.S. Embassy in Mexico City with the goal of identifying “people of interest” for the cartel to target and kill, according to a new U.S. government watchdog report.

The Mexican Sinaloa drug cartel hired a hacker to track and surveil the FBI, then used that information to intimidate and even kill witnesses.

Sometimes the surveillance state gets turned against itself. That seems to be what resulted in the unfortunate demise of a number of FBI informants, who were tracked by a hacker working for the Sinaloa cartel in Mexico, according to a recent report published by the U.S. Justice Department.