Jayson McNamara looks into the legacy of the Jewish migrant who toppled a global sex-trafficking ring in Buenos Aires almost 100 years ago.

South of the capital, in Avellaneda, 38-year-old artist Elianna Renner stands inside a jungle. Two-metre-high cacti poke at one another with their thorns, bodies of flesh entangled to form the perimeters of an impenetrable ecosystem born nearly a century ago. Neighbourhood rubbish thrown over the high dark brick wall, and some frightfully decrepit tombstones, which bear little more than a Star of David, fight for attention.