One of the largest investigations of the Argentinean judiciary was conducted because of the serious human rights violations in the complex Campo de Mayo. Only very few of the more than thousand secretly detained and tortured regime critics survived. Many victims had a trade union background...The oral main trial...began on the 2nd of November 2009...One of the adjourned parties and of the 130 witnesses is Héctor Ratto, a former Mercedes-Benz worker in González Catán (Buenos Aires), who witnessed the illegal detention and kidnapping of some of his workmates and the involvement in these acts by some executives and staff of the company.