Last December, when Alice Su touched down in Xinjiang, in northwest China, she was immediately picked off her flight by the police.  Su wasn’t exactly surprised. As the Beijing bureau chief for the Los Angeles Times, she was used to having government minders harass her as part of the Chinese Communist Party’s attempts to blunt foreign reporting. Su certainly expected it in Xinjiang, where she aimed to report on the Party’s mass detention and surveillance of Uighurs, an ethnic minor