Question: Jorge Julio López disappeared after testifying against the Argentine police officer who worked in what force during the 1970s?
Sentence (from "Miguel Etchecolatz"): Miguel Osvaldo Etchecolatz (born 1 May 1929) is a former senior Argentine police officer, who worked in the Buenos Aires Provincial Police during the first years of the military dictatorship of the 1970s.
Relevant evidence: Yes