A Colombian warlord, whose extradition to the United States had been delayed for several months while he was designated a peace negotiator by the country's previous government, was flown to California and placed in custody of federal agents.

Geovany Andres Rojas faces drug trafficking and terrorism charges in the United States. For years, he acted as a spokesman and leader of Comandos de la Frontera, a rebel group known for trafficking cocaine in Putumayo, a Colombian province that borders Ecuador and Peru.

Rojas, who is also known as "Araña" ("The Spider"), had been protected from extradition by former Colombian President Gustavo Petro, who had asked him to participate in peace talks with the Colombian governm...