LAGOS, Nigeria - Known for bringing in celebrities and smiling in photographs next to former Western leaders, a flamboyant Nigerian newspaper publisher now faces a challenge from his most vocal critics — his own employees. Workers have barricaded the front of ThisDay newspapers in Lagos, hoping to force publisher Nduka Obaigbena into paying them as much as four months' worth of back salaries due to them. Back pay disputes often hit industries in Nigeria, a country where steady paying jobs remain few, but this crisis has hit a man politically connected to the nation's ruling elite.