HARARE, ZIMBABWE - The protest was scheduled for 10 a.m., but at the appointed hour not a single demonstrator was in sight. It was like any other weekday morning on a busy Harare street, bustling with hawkers and beggars, shoppers and businessmen. Suddenly, 15 men materialized from the crowd, pulling creased signs from beneath their shirts. For a minute or so, they silently held their antigovernment placards aloft. Then as quickly as they appeared, they melted back into street, the yellow cardboard littering the ground the only evidence that any protest had occurred. Almost a year after Zimbabwe's disputed presidential...