THE HAGUE, Netherlands (AP) — An international task force formed to crack down on violence as a criminal service has led to 280 arrests in its first year, the European Union’s police agency, Europol, reported Wednesday. The arrests underscore a trend across the continent of criminals hiring people — many of them youngsters — via social media and messaging apps to carry out acts of violence ranging from assaults to murders in a chilling form of a gig economy. “Violence is no longer confined to