MAPUTO, Mozambique, Jan. 20 - Who killed Carlos Cardoso? After assassins gunned down Mr. Cardoso 62 months ago, ending his effort as a journalist to unravel a banking scandal here, the Nobel laureate Günter Grass and others made that question a rallying cry for justice, both for his murder and for Mozambique's corruption-ridden society. On Friday, in a sweltering Maputo courtroom, a judge handed...