UNITED NATIONS: It's one of the United Nations' more obscure bodies, with no space to call its own within the riverside headquarters. And there is scant insight into how it decides a question of far-reaching impact: Who gets let through the door? With an anodyne name, the UN Credentials Committee has long gone unnoticed; it doesn't even appear on the UN's own organizational chart of its many agencies, councils, committees, and departments. But when it comes to countries riven by political divisions or coups, the nine-member body is...