Backs to the wall

On my way to the conference today I passed a group of young people painting out the graffiti covering a wall opposite the city hospital. On my way back to the apartment they were well through a repainting exercise. Throughout the city there was evidence of a left-wing campaign of justice for Mariano Ferreyra (justicia por Mariano Ferreyra). From what I could gather he was killed, and others were seriously injured by an organised gang attack, with the implication other were behind his murder. The trial of the attackers was taking place later that week.