The United States has released Osiel Cardenas Guillen, former leader of the Gulf Cartel and founder of the Zetas, an armed organization that played a salient role in violent turf wars that marked Mexico over the past decades.
Cardenas had been captured in Mexico in 2003 and extradited to the U.S. four years later, where he was accused of "overseeing a vast drug-trafficking empire responsible for the import of thousands of kilos of cocaine and marijuana to the U.S. from Mexico."
