During the 1970s, he published a newspaper in Argentina that publicized human rights violations by the Argentinian government, in particular calling attention to the disappearances of people during that government's "Dirty War". As a result, he was arrested, and during interrogations he was subjected to electric shock treatments, beatings, and solitary confinement. He chronicled his experiences in his 1981 book, "Prisoner Without a Name, Cell Without a Number".
After his release, he emigrated to Israel.