What is "pishtacos"

Pishtacos is a term Peruvian police has used to refer to alleged Peruvian gangsters who were suspected of murdering up to 60 people for their fat, and sold it to intermediaries in Lima, who are thought to have then sold the fat to laboratories in Europe for suspected use in cosmetics. Later, the police chief of Peru had to quit his job when Peruvian ministries reported that the whole story was a hoax to prevent further investigations on extrajudicial killings by police forces.