Question: What is the slang term used to describe the agency that The Grupo de Operaciones Especiales  is a part of?
Sentence (from "Federal Police (Mexico)"): The Federal Police (Spanish: "Policía Federal, PF" ), formerly known as the "Policía Federal Preventiva" (Federal Preventive Police), is a Mexican police force under the authority of the Secretariat of the Interior.
Relevant evidence: No