Bregman participated among the appelants of the first trial made since the re-opening of the cases of crimes against humanity perpetrated by criminals of the Argentinian Dictatoship, that of former Buenos Aires police chief Miguel Osvaldo Etchecolatz, where Justicia Ya! La Plata in 2006 accused him of committing genocide. In the final stages of the trial, one of the eyewitnesses, Jorge Julio López, disappeared; afterwards, a case on his disappearance was opened and remains so. Bregman was also an appealing lawyer during the trial against Jorge “Tigre” Acosta, on the ESMA case.